Edexcel A-Level Physics Work Done

Practise Edexcel A-Level Physics work done through force-distance calculations, angled force components, work-energy comparisons and energy-transfer reasoning.

Exam points

calculate work done from force and displacement, including angled-force components
use work-energy comparisons to judge stopping distance, ionisation or kinetic-energy change
explain how motors, counterweights or applied forces change the work required

[Maximum number: 2]

An 'escape lane' can stop cars or trucks safely if the brakes stop working when moving downhill.

The photograph shows an escape lane.

Figure for Question 1.3.17 - Work done question 1 — Edexcel A-Level Physics AS

The escape lane is made of sand and is horizontal, as shown below. The resistive force of the sand on a vehicle reduces the kinetic energy of the vehicle.

As a truck enters the escape lane, the kinetic energy of the truck is $8.0 \times 10^{6} \mathrm{~J}$ .

The sand exerts an average resistive force of $3.5 \times 10^{5} \mathrm{~N}$ on the truck as the truck comes to rest.

Calculate the distance moved by the truck on the escape lane.

Distance =

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1.3.17 - Work done question 1