A conveyor belt in a logistics warehouse is used to lift identical parcels from the loading bay up to a mezzanine floor. All the parcels have the same mass.
During peak hours, the speed of the motor is increased so that more parcels are lifted up to the mezzanine floor in a given time.
How does this affect the work done in lifting each parcel and the useful output power of the motor?
| Work done in lifting each parcel | Useful output power of the motor | |
|---|---|---|
| A | increases | increases |
| B | no change | increases |
| C | no change | no change |
| D | increases | no change |
Work done: increases; Useful power: increases
Work done: no change; Useful power: increases
Work done: no change; Useful power: no change
Work done: increases; Useful power: no change
533 exam-style questions on CIE IGCSE Physics 1.7 Energy, work and power, covering 1.7.1a Energy stores and energy transfers, 1.7.1b Conservation of energy, 1.7.1c Kinetic and gravitational potential energy, 1.7.2 Work done, 1.7.3 Energy resources, 1.7.3a Energy resources and electricity generation, 1.7.3b Nuclear fusion as an energy source, 1.7.3c Efficiency of energy transfer, and 1.7.4 Power. Each one has a worked solution and a mark scheme showing where the marks go.