A warehouse worker is lifting a heavy crate of spare parts from the ground floor to a mezzanine storage platform. The crate is attached to a rope and pulled vertically upwards by the worker standing on the platform. The crate is then brought to rest on the platform.
Which form of energy does the crate possess that is significantly greater when it is on the mezzanine platform than when it was on the ground floor?
State the two physical measurements that must be made in order to calculate this increase in energy.
Which form of energy in the worker's body is used to raise the crate?
State the additional measurement needed, in addition to those in (a)(ii), to calculate the average useful power developed by the worker while raising the crate.
229 exam-style questions on CIE IGCSE Physics 1.7.1a Energy stores and energy transfers. Each one has a worked solution and a mark scheme showing where the marks go.