# Chapter 11 – Work And Energy

The following Topics and Sub-Topics are covered in this chapter and are available on MSVgo.com:

Introduction

Work and energy are closely interrelated. It is also possible to describe a function as the transfer of energy. In physics, the work done is defined for two objects as the transfer of energy from the first object to the second object. Also, the ability to do work is defined as energy.

Work is assumed to be carried out by a force when an object encounters movement parallel to the force’s line of operation. It is an action in the direction of the force that entails force and movement.

#### The Work and Energy Principle

The principle of work-energy states that the modification of a body’s kinetic energy is equivalent to the net work performed on the body.

This knowledge is known as the theory of work-energy which can be extracted from the conservation of energy by law.

Work Done

Work performed on an object is described as the product of the magnitude of the force acting on the body and the force-direction displacement. W = F.s

Energy

Energy is described as the capacity to do work. The machine is the same as the one at work.

SI unit of energy  = Joule (Nm)

The sources of energy are various: light, heat, chemical, electrical or mechanical.

The sum of mechanical energy is those of:

1. Kinetic Strength (K.E)
2. Potential Energy(P.E)

Kinetic Energy And Its Expression

Objects in motion have energy and are able to do work. Kinetic Energy is described by this energy.

K.E= 1/2(mv2)

Factors that control kinetic energy:

• Mass
• Velocity
• Impulse.

Potential Energy And Its Expression

This is defined as that energy where the work is done on the object, and energy can be stored in it.

ΔPE=mg(h final hinitial)

Stretching a rubber string, for instance. The energy that a body possesses as a result of its structure or position transition is known as Potential Energy.

The potential energy at the height of an object

When an object is lifted to a certain height, to adjust its location, work against gravity is completed. This energy, as potential energy, is stored.

#### Law of Conservation Of Energy

The Energy Conservation Law notes that energy cannot be produced or lost, but can be converted from one form to another. The total energy remains constant before and after the transformation.

Overall energy = KE + PE

For starters, imagine a ball dropping from a height free of charge. It has only PE = mgh at height h.

It has a velocity at the time it is about to reach the ground and therefore has KE= 1/2 (mv^2). Energy is therefore transferred from PE to KE, whereas the total energy remains the same.

Power

Power is called the rate of doing work or the rate of energy transmission. It is denoted by P

P = W/t

Watt is the SI unit.

Average power = Total consumed energy/Total time taken

#### Work vs. Energy

Work by the use of force applies to overpowering opposition. It is obvious that the resistance from the motion of the application of force has been overpowered. Energy is the power to function or execute any operation that may be thought of as possessed or stored as something. It exists in various forms, such as light, heat, power, potential energy, or other forms. Job and energy have, and are closely related to, identical units. Energy may be stored in reserve, but for work, it can not be achieved. In motion, work is electricity. Through the procedure of doing work, energy changes from one form to another.

There are usually two kinds of work: positive and negative work. If the direction of the force is in the same direction as the motion of the application spot, it is said that the work conducted is positive. If the force’s course is in the opposite direction to the movement of its point of application, it is said that negative work is done.

#### Conclusion

In this chapter, we learned about work and energy. We learned about various forms of energy and their formulas. We can further utilize this knowledge and understand concepts like work energy and its forms, and conservation of energy and power.

#### FAQs

1. What is the difference between work and energy?

Between work and energy, there is a big difference. Work is the transfer of a quantity of energy into a direction with the assistance of a force covering a given distance.

2. What is the formula of work?

Work performed on an object is described as the product of the magnitude of the force acting on the body and the force-direction displacement. W = F.s

3. What is the formula of energy?

Energy is described as the capacity to do work. The machine is the same as the one at work.

SI Unit Of Energy  = Joule (Nm)

4. What is the formula of work and energy?

• Work performed on an object is described as the product of the magnitude of the force acting on the body and the force-direction displacement. W = F.s
• Energy is described as the capacity to do work. The machine is the same as the one at work.
SI Unit Of Energy  = Joule (Nm)

5. What is the work done by time?

Power is the rate at which work is carried out or the utilization of energy. It is proportional to the amount of work completed, divided by the amount of time taken to do the work. Watt (W), which is equal to a Joule per second, is the unit of power.

To learn more about Work and Energy through simple, interactive, and explanatory visualizations, get the MSVgo app.

### High School Physics

• Alternating Current
• Atoms
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• Dual nature of Radiation and Matter
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### High School Chemistry

• Acids, Bases and Salts
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### High School Biology

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### High School Math

• Algebra – Arithmatic Progressions
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### Middle School Science

• Acids, Bases And Salts
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### Middle School Math

• Area and Its Boundary
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• Tenths and Hundredths
• Time