9.1 Work, power and theorem of work and energy - Physics | OpenStaxName (2023)

Learning Objectives section

At the end of this section you can do the following:

  • Describe and apply the work-energy law.
  • Describe and calculate work and performance.

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The learning objectives in this section will help your students master the following standards:

  • (6) Scientific Concepts. The student knows what changes occur in a physical system and applies the laws of conservation of energy and momentum. The student is expected to:
    • (A)describe and apply the work-energy theorem;
    • (C)Describe and calculate work and performance.

In addition, the High School Physics Laboratory Manual covers the following standards:

  • (6) Scientific Concepts. The student knows what changes occur in a physical system and applies the laws of conservation of energy and momentum. The student is expected to:
    • (C) Calculate the mechanical energy, the energy generated in it, the momentum applied and the amount of motion of a physical system.

Use the exercise entitled Work and Energy to supplement the content of this section.

key section conditions

Energypotential energy of gravityJouleKinetic energymechanical energy
potential energyperfomanceWattworkwork-energy theorem

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In this section, students will learn how work determines changes in kinetic energy and that power is the rate at which work is done.

[STUDY OF LAW][OL]Check your understanding of mass, velocity, and acceleration due to gravity. Define general word definitionspotentialmiKinetic.

[ALABAMA][ALABAMA]Remind students of the equation C=P mi mi =FMetroGramm C=P mi mi =FMetroGramm🇧🇷 Show that gravitational acceleration is a constant, soPHYSICAL EDUCATIONmiresulting from the work of gravity will also be constant. Compare this to the acceleration due to other forces, such as B. the application of muscles to lift a stone, which may not be constant.

The work and energy law

In physics the termworkIt has a very specific definition. Work is exertionFF, to move an object a distance,d, in the direction in which the force is applied. To work,C, is described by the equation

C=Fd. C=Fd.

Some things that we normally think of as work are not work in the scientific sense of the term. Let's look at some examples. Consider why each of the following statements is true.

  • House workIt is notwork.
  • lift a stone from the groundit iswork.
  • Carry a stone in a straight line across the lawn at a constant speedIt is notwork.

The first two examples are quite simple. The task isn't work because the objects don't move. Lifting a rock from the ground requires work because the rock will move in the direction the force is acting. The last example is less obvious. Think of the laws of motion of this forcenorequired to move an object at constant speed. Therefore, although some force may be applied to keep the stone off the ground, no net force is applied to keep the stone in constant forward motion.

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[STUDY OF LAW][OL]Explain that when this theorem is applied to an object that is first at rest and then accelerates, the 1 2 Metro v 1 2 1 2 Metro v 1 2 Term is equal to zero.

[OL][ALABAMA]Work is measured in joules and C=Fd C=Fd🇧🇷 Force is measured in newtons and distance in meters, so joules equal newton meters. ( NorteMetro ) ( NorteMetro )

work andEnergythey are closely related. When you work to move an object, you change the energy of the object. You (or an object) also use energy to do work. In fact, energy can be defined as the ability to do work. Energy can take many forms, and one form of energy can transform into another. In this chapter we deal withmechanical energy, which comes in two forms:Kinetic energymipotential energy.

  • Kinetic energy is also called kinetic energy. A moving object has kinetic energy.
  • Potential energy, sometimes called stored energy, comes in many forms.potential energy of gravityIt is the stored energy that an object has due to its position on the earth's surface (or any other object in space). A roller coaster car on top of a hill has gravitational potential energy.

Let's examine how working on an object changes the energy of the object. When we use force to lift a rock off the ground, we increase the potential energy of the rock,PHYSICAL EDUCATION🇧🇷 When we drop the stone, gravity increases the kinetic energy of the stone while the stone moves down until it hits the ground.

The force we use to lift the stone is equal to its weight,W, which is equal to its mass,Metro, multiplied by the acceleration due to gravity,Gramm.

F=W=MetroGramm F=W=MetroGramm

The work we do on the rock is equal to the force we exert multiplied by the distance,dthat we lifted up the rock. The work we do on the rock is also equal to the rock's gain in gravitational potential energy,PHYSICAL EDUCATIONmi.

C=P mi mi =MetroGrammd C=P mi mi =MetroGrammd

The kinetic energy depends on the mass of an object and its speed,v.

kmi= 1 2 Metro v 2 kmi= 1 2 Metro v 2

(Video) QTR 9.1 | Work, Energy and Power - Basic Definitions and Work Energy Theorem | Chapter 9 - Part 1

When we drop the stone, gravity makes the stone fall and gives it kinetic energy. If the work done on an object only increases its kinetic energy, the net work is equal to the change in the value of the quantity 1 2 Metro v 2 1 2 Metro v 2 🇧🇷 This is a statement bywork-energy theorem, which is expressed mathematically as

C=Dkmi= 1 2 Metro v 2 2 1 2 Metro v 1 2 . C=Dkmi= 1 2 Metro v 2 2 1 2 Metro v 1 2 .

the subscribers2mi1indicate the final or initial speed. This theorem was successfully proposed and proved by James Joule, shown inFigure 9.2.

Does the name Joule sound familiar to you? EITHERJoule(J) is the metric unit of measure for work and energy. Measuring work and energy with the same unit reinforces the idea that work and energy are related and can be converted into each other. 1.0 J = 1.0 N∙m, unit force times distance. 1.0 N = 1.0 kg m/s2, also 1,0 J = 1,0 kg∙m2/s2🇧🇷 Analysis of the conceptual units (1/2)Metrov2will produce the same Joule units.

9.1 Work, power and theorem of work and energy - Physics | OpenStaxName (1)

Figure 9.2 The joule is named after the physicist James Joule (1818–1889). (C.H. Jeens, Wikimedia Commons)

see physics

work and energy

This video explains the work energy rate and how the work done on an object increases the CU of the object.

Click here to view the content

tightness control

True or False: The energy gain of an object under gravitational force alone is equal to the product of the object's weight and the object's distance.

  1. Real
  2. NOT CORRECT

teacher support

teacher support

Review the information about kinetic and potential energy discussed earlier in this section. Ask students to distinguish and understand the two ways to increase an object's energy (1) by applying a horizontal force to increase KE and (2) by applying a vertical force to increase PE.

Calculations with work and power.

When it comes to labor-intensive applications, we're often interested in how quickly the work gets done. For example, when designing a roller coaster, the time it takes to lift a roller coaster car to the top of the first hill is an important consideration. Taking half an hour to climb will certainly annoy cyclists and reduce ticket sales. Let's look at how to calculate the time it takes to get the job done.

Remember that a course can be used to learn a lot, e.g. B. Describe work over a period of time.allowed tois the speed at which work is done. Rate means in this caseper unit of time🇧🇷 Performance is calculated by dividing the work done by the time it takes to do it.

P= C t P= C t

Let's consider an example that might help illustrate the differences between work, force, and power. Suppose the woman insideFigure 9.3Lifting the TV with a pulley takes the TV to the fourth floor in two minutes, and it takes the man carrying the TV up the stairs five minutes to reach the same place. They did the same amount of work. ( Fd ) ( Fd )on TV because they moved the same mass the same vertical distance, requiring the same upward force. However, the woman using the pulley generated more power. That's because you got the job done in a period that's shorter than the denominator in the performance formula,t, is smaller. (For the sake of simplicity, we will leave out the fact that the man who climbed the ladder also worked on himself.)

9.1 Work, power and theorem of work and energy - Physics | OpenStaxName (2)

Figure 9.3 No matter how you move a TV to the fourth floor, the workload and potential energy gain are the same.

Power can be expressed in units ofWatt(C). This device can be used to measure power related to any form of energy or work. You've probably heard the term related to electrical devices, especially lightbulbs. Multiplying power by time gives the amount of energy. Electricity is sold in kilowatt hours as this is the amount of electrical energy consumed.

The unit watt is named after James Watt (1736-1819) (cfFigure 9.4🇧🇷 He was a Scottish engineer and inventor who discovered how to get more power out of steam engines.

9.1 Work, power and theorem of work and energy - Physics | OpenStaxName (3)

Figure 9.4 Think James Watt and Vatios? (Carl Frederik von Breda, Wikimedia Commons)

teacher support

teacher support

[STUDY OF LAW][OL]Review the concept that work changes the energy of an object or system. Check the units for work, energy, force, and displacement. Use the mechanical energy and work equations to show what is and is not work. Explain why holding or carrying something on a flat surface is not work in the scientific sense.

(Video) QRTQ 9.1 | Work, Energy and Power - Basic Definitions and Work Energy Theorem | Chapter 9 - Part 1

[OL]Have students use the mechanical energy equations to explain why they are work and why they are not. Ask them to give more examples until they understand the difference between the scientific termsworkand a task that is just plain difficult but doesn't actually work (in the scientific sense).

[STUDY OF LAW][OL]Emphasize that performance is a rate, and that rate means "per unit of time." In the metric system, this unit is usually seconds. Finish the section by clearing up any misconceptions about the distinction between force, work, and power.

[ALABAMA]Explain the relationships between the units of force, work and power. Yes C=Fd C=Fdand the work can then be expressed in J P= C t = Fd t P= C t = Fd t then the power can be expressed in units of NorteMetro s NorteMetro s

Also explain that we buy electricity in kilowatt hours because when power is multiplied by time, the units of time cancel out and what is left is work or energy.

Links to Physics

Watt steam engine

James Watt didn't invent the steam engine, but once he finished tinkering with it, it became more useful. Early steam engines were not only inefficient, they also produced back and forth motion, ormutually, Movement. This was natural because the pistons move in and out as the pressure in the chamber changes. This constraint worked well for simple tasks like pumping water or pounding potatoes, but not so well for moving a train. Watt was able to build a steam engine that converted reciprocating motion into circular motion. With this innovation, the industrial revolution was underway. The world would never be the same again. One of Watt's steam engines is shown in theFigure 9.5🇧🇷 The video that follows the illustration explains the importance of the steam engine in the industrial revolution.

9.1 Work, power and theorem of work and energy - Physics | OpenStaxName (4)

Figure 9.5 A late version of the Watt steam engine. (Nehemiah Hawkins, Wikimedia Commons)

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teacher support

Start a discussion about the historical significance of the sudden increase in the amount of energy available for industry and transport. Ask the students to consider the fact that the speed of the shuttle has increased about 10 times. Changes in the way goods were made were also important. Ask students how they think the resulting lifestyle changes compare to more recent changes brought about by innovations such as air travel and the internet.

see physics

Watt's role in the industrial revolution

This video shows how the Watts resulting from Watt's inventions helped make the Industrial Revolution possible and usher England into a new historical era.

Click here to view the content

tightness control

What mechanical energy does the steam engine produce?

  1. potential energy
  2. Kinetic energy
  3. Nuclear energy
  4. solar power

Before proceeding, make sure you understand the differences between force, work, energy, and power. Force applied to an object over a distance works. Work can increase energy, and energy can create work. Power is the speed at which work is done.

worked example

Application of the work and energy law

A skater with a mass of 50 kg is skating on the ice at a speed of 8 m/s when her friend approaches her from behind and pushes her, increasing her speed to 12 m/s. How much work did the boyfriend do on the skater?

Strategy

The work energy law can be applied to the problem. Write the equation for the theorem, simplifying where possible.

(Video) Work

C=DKE= 1 2 Metro v 2 2 1 2 Metro v 1 2 C=DKE= 1 2 Metro v 2 2 1 2 Metro v 1 2

simplify forC= 1 2 Metro( v 2 2 v 1 2 ) simplify forC= 1 2 Metro( v 2 2 v 1 2 )

solution

Identify the variables.Metro= 50 kg,

v 2 =12 Metro s , mi v 1 =8 Metro s v 2 =12 Metro s , mi v 1 =8 Metro s

9.1

Ersatz.

C= 1 2 50( 12 2 8 2 )=2,000j C= 1 2 50( 12 2 8 2 )=2,000j

9.2

discussion

Working on an object or system increases its energy. In this case, the increase corresponds to the skater's kinetic energy. It follows that the energy increase must be the difference between KE before and after the collision.

Tips for Success

This problem illustrates a general technique for approaching problems that require the use of formulas: identify the unknown and known variables, express the unknown variables in terms of the known variables, and then substitute any known values.

teacher support

teacher support

Identify the three variables and select the appropriate equation. Distinguish between initial and final speed and pay attention to the minus sign.

Identify the variables.Metro= 50 kg,

v 2 =12 Metro s , mi v 1 =8 Metro s v 2 =12 Metro s , mi v 1 =8 Metro s

Ersatz.

C= 1 2 50( 12 2 8 2 )=2,000j C= 1 2 50( 12 2 8 2 )=2,000j

practical problems

1.

9.1 Work, power and theorem of work and energy - Physics | OpenStaxName (5)(Credit: Work modified by Pass My Exams, CC BY-SA 4.0)

Figure 9.6

A weightlifter lifts a 200N barbell off the floor to a height of 2m. How much work is done?

(Video) A skier traveling 9.0 m/s reaches the foot of a steady upward 19' incline and glides 12 m up along t

  1. 0\,\text{J}

  2. 100\,\text{J}

  3. 200\,\text{J}

  4. 400\,\text{J}

2.

Identify which of the following actions generates the most energy. Show your work.

  • wear a100\,\text{N}TV for the second floor in50\,\text{s}Ö
  • wear a24\,\text{N}Watermelon into the second floor10\,\text{e}?
  1. wear a100\,\text{N}The TV generates more electricity than charging24\,\text{N}Watermelon equals because power is defined as the work done multiplied by the time interval.

  2. wear a100\,\text{N}The TV generates more electricity than charging24\,\text{N}Watermelon on par, because performance is defined as the ratio of work done to time interval.

  3. wear a24\,\text{N}Watermelon generates more energy than wearing one100\,\text{N}TV at the same level, since power is defined as work done per time interval.

  4. wear a24\,\text{N}Watermelon generates more energy than wearing one100\,\text{N}TV at the same level, since performance is defined as the ratio of work done to time interval.

check your understanding

3.

Identify two properties that are expressed in joules.

  1. work and strength

  2. energy and weight

  3. work and energy

  4. weight and strength

4.

If a coconut falls from the tree, it worksCit is done while falling to the beach. This work is described by the equation

C=Fd= 1 2 Metro v 2 2 1 2 Metro v 1 2 . C=Fd= 1 2 Metro v 2 2 1 2 Metro v 1 2 .

9.3

determine amountsF,d,Metro,v1, miv2at this event.

(Video) Work Energy and Power | Revision | Mlungisi Nkosi

  1. Fis gravity, which is equal to the weight of the coconut,dis the distance the nut falls,Metrois the mass of the earthv1is the initial speed andv2is the speed at which it reaches the beach.
  2. Fis gravity, which is equal to the weight of the coconut,dis the distance the nut falls,MetroIt's the coconut pastev1is the initial speed andv2is the speed at which it reaches the beach.
  3. Fis gravity, which is equal to the weight of the coconut,dis the distance the nut falls,Metrois the mass of the earthv1is the speed at which it reaches the beach, andv2is the initial speed.
  4. Fis gravity, which is equal to the weight of the coconut,dis the distance the nut falls,MetroIt's the coconut pastev1is the speed at which it reaches the beach, andv2is the initial speed.

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teacher support

Use the comprehension questions to assess whether students have met the learning objectives for the section. When students are struggling with a specific goal, Check Your Understanding helps identify the goal and directs students to relevant content.

FAQs

What is work power and energy in physics? ›

Work, Energy and Power are fundamental concepts of Physics. Work is said to be done when a force (push or pull) applied to an object causes a displacement of the object. We define the capacity to do the work as energy. Power is the work done per unit of time.

What is work, energy theorem? ›

The work-energy theorem states that the net work done by the forces on an object equals the change in its kinetic energy.

What is Ke formula? ›

Kinetic energy is directly proportional to the mass of the object and to the square of its velocity: K.E. = 1/2 m v2. If the mass has units of kilograms and the velocity of meters per second, the kinetic energy has units of kilograms-meters squared per second squared.

How do you calculate work, energy and power? ›

use the following equations:
  1. work done = force × distance moved in direction of force.
  2. change in gravitational energy = mgh.
  3. power = work donetime taken, power = rate of energy transfer.
  4. power = force × velocity.
  5. efficiency = useful energy transferredtotal work done × 100 %

What is the SI unit of work? ›

The SI unit of work is the joule (J). It is defined as the work done by a force of one newton through a distance of one metre.

What is energy formula? ›

The equation developed by Albert Einstein, which is usually given as E = mc2, showing that, when the energy of a body changes by an amount E (no matter what form the energy takes), the mass (m) of the body will change by an amount equal to E/c2.

What is the work function φ? ›

The work function, Φ, is the minimum amount of energy required to induce photoemission of electrons from a metal surface, and the value of Φ depends on the metal.

What is work-energy example? ›

For example, a man pushing a wall is applying force to move to a certain distance. The wall does not move, and hence the work done comes out to be zero. However, the energy of the man is released while pushing a wall.

What is the SI unit of energy? ›

The SI unit of energy is same as that of work, which is joule (J).

Is KE and W same? ›

In other words, the work done is equal to the change in K.E. of the object! This is the Work-Energy theorem or the relation between Kinetic energy and Work done. In other words, the work done on an object is the change in its kinetic energy. W = Δ(K.E.)

What is KE vs PE? ›

Potential energy is the stored energy in any object or system by virtue of its position or arrangement of parts. However, it isn't affected by the environment outside of the object or system, such as air or height. On the other hand, kinetic energy is the energy of an object or a system's particles in motion.

What is the KE unit? ›

The units of kinetic energy are mass times the square of speed, or kg · m 2 /s 2 kg · m 2 /s 2 . But the units of force are mass times acceleration, kg · m/s 2 kg · m/s 2 , so the units of kinetic energy are also the units of force times distance, which are the units of work, or joules.

What is the total work formula? ›

Work can be calculated with the equation: Work = Force × Distance. The SI unit for work is the joule (J), or Newton • meter (N • m). One joule equals the amount of work that is done when 1 N of force moves an object over a distance of 1 m.

What is the relationship of work power and energy? ›

Force exerted on an object over a distance does work. Work can increase energy, and energy can do work. Power is the rate at which work is done.

What is power physics PDF? ›

POWER (PHYSICS) In physics, power (symbol: P) is the amount of work done per unit of time. Definition. This can be modeled as an energy flow, equivalent to the rate of change of the energy in a system, or the time rate of doing work, where P is power E is energy W is work t is time.

Is work scalar or vector? ›

Force and displacement are combined to form the formula for work. Work is a scalar quantity as a result.

What are the 3 units of work? ›

Three quantities must be known in order to calculate the amount of work. Those three quantities are force, displacement and the angle between the force and the displacement.

What are the 4 units of work? ›

Some commonly used work units also include erg in the CGS system, the horsepower-hour, the newton-metre, the foot-pound, the kilowatt-hour, the foot-poundal, and the litre-atmosphere.

What is called energy? ›

Energy is the ability to do work

There are many different forms of energy, including: Heat. Light. Motion. Electrical.

What is work class 9? ›

Work (W) Work is defined as a force acting upon an object to cause a displacement. It is expressed as the product of force and displacement in the direction of force. W=F x s.

What is power * time? ›

Definition. Power is the rate with respect to time at which work is done; it is the time derivative of work: where P is power, W is work, and t is time. If a constant force F is applied throughout a distance x, the work done is defined as .

What is work function formula? ›

Since work function does not depend on wavelength of incident light so it will be constant for both cases. Thus, W=λ2hc−eVs1.

What does the θ represent in the work equation? ›

Theta represents the angle which work is being applied to an object.

Why is it called work function? ›

We need additional energy for the removal of an electron to overcome the surface barrier of the metal is called the work function of the metal. The minimum energy required for an electron to just escape from the metal surface is called “work function”.

What are the two types of energy? ›

Many forms of energy exist, but they all fall into two basic categories: Potential energy. Kinetic energy.

What are 4 examples of energy? ›

Energy exists in many different forms. Examples of these are: light energy, heat energy, mechanical energy, gravitational energy, electrical energy, sound energy, chemical energy, nuclear or atomic energy and so on.

What is difference between work and energy? ›

There is a significant difference between work and energy. Work is the transferring of an amount of energy with the help of a force covering a particular distance in a direction. Energy is also referred to as the force that works at a certain distance. Both of these can be termed scalar units.

What is SI of joule? ›

The SI unit for energy is the joule (J): 1 J=1 newton metre (N m).

Which is unit of force? ›

The SI unit of force is the newton, symbol N.

What is the symbol of energy? ›

The common symbol for energy is the uppercase letter E. The standard unit is the joule, symbolized by J. One joule (1 J) is the energy resulting from the equivalent of one newton (1 N) of force acting over one meter (1 m) of displacement. There are two main forms of energy, called potential energy and kinetic energy.

Is kinetic energy a force? ›

Kinetic energy is the energy an object has because of its motion. If we want to accelerate an object, then we must apply a force. Applying a force requires us to do work.

What is force used for? ›

Force can make a body that is at rest to move. It can stop a moving body or slow it down. It can accelerate the speed of a moving body. It can also change the direction of a moving body along with its shape and size.

What is force * distance? ›

Work = Force times Distance = Energy.

Is kinetic energy positive or negative? ›

Because mass can't be negative and the square of speed gives a non-negative number, kinetic energy can't be negative. Either something is moving and has positive kinetic energy, or it is not moving and has zero kinetic energy.

Is potential energy can be negative? ›

Same is the case with electrons bounded to atoms in Quantum Physics. Reason : Potential energy is always negative and if it is greater than kinetic energy total mechanical energy will be negative.

Where is the kinetic energy zero? ›

If it is not in motion, the kinetic energy of that object is zero. Kinetic energy can never be a negative value. Kinetic energy can be quantified as one half of the mass times the velocity squared (KE = 1/2*m*v²).

What are the 4 types of kinetic energy? ›

There are five main types of kinetic energy: radiant, thermal, sound, electrical, and mechanical.

What is energy made of? ›

Energy is not made of anything, energy is a term used to describe a trait of matter and non-matter fields. When matter has velocity, for example, it is said to have kinetic energy. There are also various forms of potential energy.

What formula is MGH? ›

Gravitational potential energy is calculated by the formula E =mgh (m is the mass of the object in kilograms, g is a constant related to Earth's gravitational force accelerating objects towards its centre at 9.8 m/s/s and h is the height of the object in metres.

How do I calculate force? ›

Force exerted by an object equals mass times acceleration of that object: F = m ⨉ a. To use this formula, you need to use SI units: Newtons for force, kilograms for mass, and meters per second squared for acceleration.

What is called work done? ›

To move an object, it should be transferred to energy. Transferring energy can be in the method of force. This quantity of energy transferred by the force to move an object is termed as work done.

What are the factors of work? ›

Work factors can be physical, chemical and climatic exposures at the workplace, ergonomic demands or psychosocial exposures and demands at work. Physical work environment factors include noise, vibrations and ambient air quality; ergonomic demands can be poor work postures, handling of heavy loads or repetitive work.

What is the main difference between work and power? ›

Work is the energy needed to apply a force to move an object a particular distance. Power is the rate at which that work is done.

What is difference between energy and power? ›

Energy is the capacity to do some physical activities or work, such as running, jumping, etc., while power is defined as the rate at which the energy is transferred, or the work is completed. The unit used to measure energy is joules, ergs and calories. Power is measured in watts.

Which best defines work? ›

In physics, work is defined as the use of force to move an object. For work to be done, the force must be applied in the same direction that the object moves. Work is directly related to both the force applied to an object and the distance the object moves.

What is power and its types? ›

Personal power is the ability to control the environment around you. This can be accomplished through the five different types of power: reward power, coercive power, legitimate power, expert power, and referent power.

Is power a watt or Joule? ›

Watts are the SI unit of power. Kilowatts are equivalent to 1,000 Watts and are the most frequently used unit of electrical power. Power in general is defined as energy over time. Watts are defined as 1 Watt = 1 Joule per second (1W = 1 J/s) which means that 1 kW = 1000 J/s.

What is called real power? ›

Real power is the power actually consumed due to the resistive load and apparent power is the power the grid must be able to withstand. The unit of real power is watt while apparent power unit is VA (Volt Ampere)

What is an energy in physics? ›

energy, in physics, the capacity for doing work. It may exist in potential, kinetic, thermal, electrical, chemical, nuclear, or other various forms. There are, moreover, heat and work—i.e., energy in the process of transfer from one body to another.

What is work in physics definition? ›

work, in physics, measure of energy transfer that occurs when an object is moved over a distance by an external force at least part of which is applied in the direction of the displacement.

What is work and energy? ›

Work is defined as transferring energy into an object so that there is some displacement. Energy is defined as the ability to do work. Work done is always the same. Energy can be of different types such as kinetic and potential energy.

What is work, energy simple definition? ›

Work is the transfer of mechanical energy from one object to another. Since work is a movement of energy, it is measured in the same units as energy: joules (J).

What is the SI unit for energy? ›

Joule (J).

This is the basic energy unit of the metric system, or in a later more comprehensive formulation, the International System of Units (SI). It is ultimately defined in terms of the meter, kilogram, and second.

What are the 2 types of energy? ›

Many forms of energy exist, but they all fall into two basic categories:
  • Potential energy.
  • Kinetic energy.

What are types of energy? ›

Energy comes in six basic forms: chemical, electrical, radiant, mechanical, thermal and nuclear. In other research, you may find additional forms mentioned such as electrochemical, sound, electromagnetic and others.

What are the types of work? ›

The 5 Types of Work That Fill Your Day
  • Reactionary Work. ...
  • Planning Work. ...
  • Procedural Work. ...
  • Insecurity Work. ...
  • Problem-Solving Work.
11 Mar 2012

What is called a work? ›

work, labor, travail, toil, drudgery, grind mean activity involving effort or exertion. work may imply activity of body, of mind, of a machine, or of a natural force.

Is work a scalar or vector? ›

Force and displacement are combined to form the formula for work. Work is a scalar quantity as a result.

What is unit of work and energy? ›

The standard unit used to measure energy and work done in physics is the joule, which has the symbol J. In mechanics, 1 joule is the energy transferred when a force of 1 Newton is applied to an object and moves it through a distance of 1 meter. Another unit of energy you may have come across is the Calorie.

Why do we define work? ›

The definition of work in physics reveals its relationship to energy – whenever work is done, energy is transferred. Work is the product of the component of the force in the direction of the displacement and the magnitude of this displacement.

Is work also called energy? ›

Work is referred to as the displacement of an object when a force (push or pull) is applied to it while energy is referred to as the capacity to do the work. It exists in various forms like potential, kinetic, chemical, thermal, nuclear, electrical energy and so on. Power is the work done per unit of time.

Videos

1. Energy Overview
(ASCPhysicsAndAstronomy)
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