O-LevelPhysicsEnergy & Work5054/22 · May/June 2025 · Q28 Marks
Fig. 2.1 shows a fork-lift truck used to lift a load. fork-lift truck load [Figure 2.1] When lifting the load, the electric motor on the fork-lift truck has a useful output power of 600 W.
- (a)Define 'power'.[1]
- (b)The efficiency of the motor is 70%. Calculate the input power to the motor. input power = ....................................................W[2]
- (c)(i)The fork-lift truck lifts a load with mass of 50 kg through a vertical distance of 2.3 m. Calculate the work done in lifting the load. work done = ....................................................J[2]
- (c)(ii)Calculate the time taken to lift the load. time taken = ....................................................s[2]
- (d)Describe how energy is transferred to thermal energy as the load is lifted by the fork-lift truck.[1]
This question uses a diagram from the original paper, which isn't shown here. Open the full paper from the past papers archive to see it.
Mark scheme
Marking points from the official mark scheme (May/June 2025). The mark or mark type is shown in brackets.
- [1] (a) work done or energy per unit time
- [1] (b) (input power =) power output / efficiency in any form
- [1] (b) 860 (W)
- [1] (c)(i) (work =) force × distance or mgh
- [1] (c)(i) 1100 (J)
- [1] (c)(ii) (time =) work ÷ (output) power
- [1] (c)(ii) 1.9 or 1.8 s
- [1] (d) Any one of: friction / air resistance; electrical heating
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