Fig. 2.1 presents a fork-lift truck being used to raise a load.
While the load is being lifted, the electric motor on the fork-lift truck has a useful output power of 600 W.
(a)[1]
Define the term ‘power’.
(b)[2]
The efficiency of the motor is 70%.
Calculate the power supplied to the motor.
(c(i))[2]
The fork-lift truck raises a load of mass 50 kg through a vertical height of 2.3 m.
Calculate the work done in lifting the load.
(c(ii))[2]
Calculate how long it takes to lift the load.
(d)[1]
Describe the way energy is transferred to thermal energy while the fork-lift truck lifts the load.
Worked solution & mark scheme
This 8-mark question has a full step-by-step worked solution and mark scheme. One marking point: “Work done or energy transferred in each unit time” …