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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.

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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.

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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.

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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.

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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?

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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