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Cambridge IGCSE Physics · 0625

Chapter 1: Motion, forces and energy — Part 10

Topic 1.7.2 · Work

Work done

Mechanical or electrical work done is equal to the energy transferred.

Mechanical working: W = Fd = ΔE

F is the force in the direction of motion, d is the distance moved in that direction. Unit of work and energy: joule (J). 1 J = 1 N m.

A constant force of 25 N pushes a crate 4.0 m in the direction of the force. Calculate the work done.

Worked example: work done is 25 newtons times 4.0 metres equals 100 joules
W = Fd = 100 J. That is also the energy transferred.
A constant force moving an object a distance d in the direction of the force, with W = Fd equal to the energy transferred.
Diagram 1: A constant force moving an object a distance d in the direction of the force, with W = Fd equal to the energy transferred.

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