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1.7 Energy, work and power

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Question 69

Four different motors are used to lift loads of different masses vertically through the same height.

MotorMass of load / kgTime taken / sP15015Q15030R30015S30030 \begin{array}{|c|c|c|}\hline \text{Motor} & \text{Mass of load / kg} & \text{Time taken / s} \\ \hline \text{P} & 150 & 15 \\ \hline \text{Q} & 150 & 30 \\ \hline \text{R} & 300 & 15 \\ \hline \text{S} & 300 & 30 \\ \hline \end{array} MotorPQRS​Mass of load / kg150150300300​Time taken / s15301530​​

Which motor has the greatest power output?

A

P

B

Q

C

R

D

S

Markscheme

1.7 Energy, work and power Questions

  1. IGCSE
  2. /Physics
  3. /1.7 Energy, work and power

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.

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