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← Topic 5 overviewTOPIC 5 ASSESSMENT

Work, energy and power

CIE-style questions assess work, energy conservation, power and efficiency.

Objective question 1

Work done by a constant force at angle θ to displacement is:

Objective question 2

The area under a force–displacement graph represents:

Objective question 3

Doubling an object's speed changes its kinetic energy by a factor of:

Objective question 4

For a force parallel to velocity, instantaneous power is:

Objective question 5

An efficiency of 0.65 means:

Structured question 1

A 40 N force moves an object 3.0 m at 60° to the displacement. Calculate the work done.

Structured question 2

Calculate the kinetic energy of a 1200 kg car travelling at 15 m s⁻¹.

Structured question 3

A motor supplies 12 kW and is 75% efficient. Calculate its useful output power.