Work energy theorem quiz for A Level physics: 10 questions with answers

Quick answer: Work done is the energy a force transfers, W = F s cos θ, measured in joules. This Physics 11-12 quiz checks work energy theorem with 10 multiple-choice questions and instant feedback; every answer comes with a short explanation.

Ten multiple-choice questions on work, kinetic and potential energy, power and efficiency. Choose the best option, then read the explanation, because the distractors are the mistakes students make most often.

Level: Physics grades 11-12 (A Level · IB · Class 11-12) · Curriculum: IB A.3

A constant force acts at 90° to the displacement of an object. How much work does the force do?

A force does 60 J of work on a trolley that was at rest and there are no other forces. What is the kinetic energy?

A ball falls from rest through 5.0 m. Ignoring air resistance, which expression gives its speed?

What is the area under a force-displacement graph?

A 2.0 kW motor lifts a load and delivers 1.5 kW of useful power. What is its efficiency?

A car's speed doubles. By what factor does its kinetic energy change?

A runner pushes forward on the ground and the ground does not move. What can you say about the work done by the ground's force on her?

A lorry climbs a hill at constant speed. Which statement is correct?

A 60 W lamp is on for 5.0 minutes. How much energy does it transfer?

Which quantity is a vector?

Formula for work done by a force? — W = F s cos θ

Unit of work and energy? — The joule, J (1 N m)

Work-energy theorem? — Net work = change in kinetic energy

Kinetic energy formula? — KE = ½ m v²

Gravitational potential energy change? — ΔE_p = m g Δh

What does the area under a F-s graph give? — The work done

Definition of power? — Rate of doing work, P = W/t

Power from force and speed? — P = F v

Efficiency formula? — Useful output ÷ total input × 100 %

Work done by a force perpendicular to motion? — Zero