What is the definition of work done in Physics according to the AQA GCSE curriculum?

In the AQA GCSE Physics curriculum, work done is defined as the energy transferred when a force moves an object over a distance. It is calculated using the formula: Work Done = Force x Distance, where the force is in the direction of the movement.

How is energy transfer related to work done in the context of forces?

Energy transfer and work done are closely related concepts in Physics. When work is done on an object by a force, energy is transferred to or from the object. This transfer of energy can result in changes in the object's kinetic or potential energy, depending on the nature of the force and the movement involved.

What are the units of work done and how do they relate to energy transfer?

The unit of work done is the joule (J), which is the same as the unit for energy. This is because work done is essentially a measure of energy transfer. One joule is equivalent to the work done when a force of one newton moves an object one meter in the direction of the force.

Can you explain how to calculate work done with an example?

Certainly! To calculate work done, you use the formula: Work Done = Force x Distance. For example, if a force of 10 newtons is applied to push a box 5 meters across the floor, the work done is 10 N x 5 m = 50 joules. This means 50 joules of energy is transferred to the box.

What factors affect the amount of work done on an object?

The amount of work done on an object is affected by two main factors: the magnitude of the force applied and the distance over which the force is applied. Additionally, the direction of the force relative to the direction of movement is crucial; only the component of the force in the direction of movement contributes to the work done.

Work Done and Energy Transfer – Study Notes & Past Paper Style Questions | AQA GCSE Physics 8463

At a glance

$W = F \, s$ — work done = force × distance moved in direction of force.
Unit: joule (J) = N·m.
Work done against friction → thermal store of surfaces.
Work done lifting → gravitational potential store.
If force is perpendicular to motion, NO work is done by that force.

What you should be able to do

4.5.2 — Recall and apply $W = Fs$ .
4.5.2 — Relate work done to energy transferred.
4.5.2 — Identify where the transferred energy ends up.

Study notes

Work done = force × distance

W = Fs. Joule = newton-metre.

Work done by a force on an object equals the magnitude of the force multiplied by the distance the object moves in the direction of the force:

$W = F \, s$

$W$ in joules (J).
$F$ in newtons (N).
$s$ in metres (m).

1 joule = 1 newton-metre. They are exactly the same unit, but J is preferred for energy and N·m for torque.

Worked example. A 50 N push moves a box 4 m.

$W = 50 \times 4 = 200\,\text{J}$

200 J of energy has been transferred from the pusher's chemical store to the kinetic and/or thermal stores of the box and floor.

Worked example. Lifting a 5 kg load 2 m up.

Force needed (against gravity): $F = mg = 5 \times 9.8 = 49\,\text{N}$ .
Work done: $W = 49 \times 2 = 98\,\text{J}$ .
Where it goes: 98 J of gravitational potential energy gained ( $E_p = mgh = 5 \times 9.8 \times 2 = 98\,\text{J}$ ). Consistent!

W = Fs.
J = N·m.
Work transferred = energy transferred.

Where does the work-energy go?

Depends on what the force is acting against — friction, gravity, or accelerating the object.

Work done by a force always equals the energy it transfers. The destination depends on the situation:

Force does work…	Energy goes to
Lifting against gravity	Gravitational PE store
Stretching a spring	Elastic PE store
Accelerating an object	Kinetic store
Against friction	Thermal store of surfaces
Against air resistance	Thermal store of air

Worked example. Pushing a 10 kg box at constant velocity across a rough floor with a 30 N force, distance 5 m.

Work done: 30 × 5 = 150 J.
Since velocity is constant, kinetic store doesn't change.
The 150 J therefore goes to the thermal store of the floor and box (friction).

If the force is perpendicular to motion (e.g. centripetal force on an orbiting satellite), no work is done — distance in the force direction is zero.

Work = energy transferred.
Against gravity → GPE; against friction → thermal.
Perpendicular force does no work.

Quick recap

W = Fs.
J = N·m.
Work done = energy transferred.
Work against friction → thermal store.
Work against gravity → GPE.
Force perpendicular to motion: zero work.

Exam tips

State the formula first: W = Fs.
If asked 'where did the energy go?', name the store (thermal, GPE, kinetic, elastic).
Be careful with units — answer in J, not N·m, in physics contexts.
Distance is the displacement IN THE DIRECTION OF THE FORCE.

Frequently asked questions

Sources: AQA GCSE Physics 8463 specification — section 4.5.2 · Last reviewed 2026-05-25 · AQA GCSE · Physics 8463 Higher & Foundation Tier

Work Done and Energy Transfer