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Work and Energy Practice

Solve chapter-level practice questions for Work and Energy with reveal-only solutions and quick revision support.

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Practice Test 1

Meaning of work and simple formula use.

Q1. A force of 20 N moves a box through 5 m in the same direction. Find the work done.

Q2. Why is no work done when a person pushes a wall that does not move?

Q3. When can work done be negative?

Kinetic and potential energy revision.

Q1. Find the kinetic energy of a 2 kg body moving at 3 m/s.

Q2. Find the potential energy of a 5 kg object kept 4 m above the ground, taking g = 10 m/s^2.

Q3. Name the energy change in a falling object.

Power and electrical energy questions.

Q1. A machine does 600 J of work in 30 s. Find its power.

Q2. Is kilowatt-hour a unit of power or energy?

Q3. Convert 2 kWh into joules.

Conservation and transformation of energy.

Q1. State the law of conservation of energy.

Q2. What energy changes take place in an electric bulb?

Q3. Why does a pendulum keep exchanging kinetic and potential energy?

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Why is everyday 'work' different from physics work?

Because in physics, work needs both force and displacement. Effort alone is not enough.

How do I remember the difference between energy and power?

Energy tells how much work can be done, while power tells how fast that work is done.

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