Edexcel IGCSE Physics 4.15 Energy Conservation Links Questions

Use energy conservation to connect changes in height and speed with work done by friction or an applied force in ramps, braking and falling objects.

Exam points

Calculate energy lost on a ramp by subtracting kinetic energy gained from gravitational potential energy lost.
Explain how friction makes the work done exceed the increase in GPE by transferring mechanical energy to the surroundings.
Calculate braking distance by setting work done by the braking force equal to the truck’s initial kinetic energy.
Explain how additional mechanical work lets a falling hammer gain more kinetic energy than the gravitational potential energy it loses.

[Maximum number: 2]

A student uses this apparatus to investigate the force needed to pull a block along a ramp.

Explain why the work done to move the block along the ramp is greater than the increase in the GPE store of the block.

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