Worksheet: Work, Force And Energy - Class 4 PDF Download

Multiple Choice Questions

Q.1. Which of the following represents the formula for calculating work?
(a) W = F × d
(b) W = F + d
(c) W = F / d
(d) W = F - d

Ans. (a)

Work is calculated by multiplying the force applied to an object by the distance it moves in the direction of the force.

Q.2. What is the SI unit of work?
(a) Newton
(b) Meter
(c) Joule
(d) Watt

Ans. (c)

The SI unit of work is the joule, which represents the amount of energy transferred when a force of one newton is applied to move an object one meter.

Q.3. Energy is defined as the capacity of a system or object to __________.
(a) Move
(b) Accelerate
(c) Perform work
(d) Resist motion

Ans. (c)

Energy refers to the capacity of a system or object to perform work, which involves the application of force and resulting in movement.

Q.4. Which of the following represents the formula for calculating power?
(a) P = W × t
(b) P = W / t
(c) P = W + t
(d) P = W - t

Ans. (b)

Power is calculated by dividing the work done by the time taken. It represents the rate at which work is done or energy is consumed.

Q.5. The SI unit of power is __________.
(a) Newton
(b) Meter
(c) Joule
(d) Watt

Ans. (d)

The SI unit of power is the watt, which is equal to joules per second (J/s). It is named after James Watt, the developer of the steam engine.

Short Questions

Q.1. Define work in the context of physics.

Work in the context of physics is defined as the result of an external force applied to a body or object, causing it to move. It involves the application of force and resulting in a movement in the direction of the force.

Q.2. What is the unit of work? Provide an example.

The unit of work is the joule (J). For example, if a 5 newton force is applied to an object, causing it to move 2 meters, the work done would be 10 joules.

Q.3. Explain the concept of energy and give two examples of different types of energy.

Energy refers to the capacity of a system or object to perform work. Two examples of different types of energy are:

• Kinetic energy: The energy possessed by an object due to its motion. For example, a moving car has kinetic energy.
• Potential energy: The energy stored in an object due to its position or state. For example, a stretched spring has potential energy.

Q.4. How is power defined in physics?

Power in physics is defined as the rate at which work is done or energy is consumed. It represents the amount of energy transformed or work performed per unit time.

Q.5. What is the SI unit of power? Who is it named after?

The SI unit of power is the watt (W), named after James Watt, the developer of the steam engine. One watt is defined as the power required to perform one joule of work in one second.

Fill in the Blanks

1. Work is the result of an external ______ applied to a body or object, causing it to move.

Ans. force

2. The formula to calculate work is ________.

Ans. W = F × d

3. Work is measured in _______.

Ans. joules (J)

4. Energy refers to the capacity of a system or object to _______.

Ans. perform work

5. The SI unit for power is _______.

Ans. watt (W)

Match the Column

Match the terms in Column A with their corresponding definitions in Column B.

Ans.

True or False

For each statement, write "True" if the statement is correct or "False" if the statement is incorrect.

1. Work is the result of an internal force applied to a body or object.

Ans. False

2. The unit of work is joules.

Ans. True

3. Energy can be created or destroyed. 

Ans. False

4. Power is the rate at which work is done.

Ans. True

5. The SI unit of power is the newton (N).

Ans. False