Edexcel IGCSE Physics 4.12 work and energy transfer
Practise work-energy transfer by recognising when the same numerical energy value is required for useful work or stored energy.
- Syllabus
- First assessment 2019
- Course
- Physics 4PH1
Exam points
- State useful work done or transferred energy when the same stored-energy value is required.
4.12 Work and energy transfer question 1
The photograph shows a toy car. When the toy car is pulled backwards, energy is stored in the elastic store as the rubber band is twisted.
When the car is released, some of the energy from the elastic store is transferred to the kinetic store of the car.
The remaining energy is transferred into the thermal store of the surroundings.
The car is pulled backwards again.
When released, 45 J of energy transfers into the car's kinetic store.
The car travels a distance of 7.5 m during this energy transfer.
State the useful work done on the car.
work done = ............ J
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