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1.7.4 Power

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Question 4
a.

Define work done.

[1]
b.

From the list below, select the two quantities that are needed to calculate the power of a machine:

  • acceleration of the object
  • mass of the object
  • speed of the object
  • time taken to do the work
  • work done by the machine
[1]
c.

A crane at a construction site lifts 10 steel beams, each of mass 150 kg150\text{ kg}150 kg, through a vertical height of 60 m60\text{ m}60 m in a time of 45 s45\text{ s}45 s.

Calculate the useful power needed to lift the beams through this height. (State the value of ggg you use in your calculation.)

[4]
d.

The crane is driven by an electric motor. State a reason, other than friction, why the total power supplied by the motor is greater than the useful power needed to lift the beams.

[1]
Markscheme

1.7.4 Power Questions

  1. IGCSE
  2. /Physics
  3. /1.7.4 Power

95 exam-style questions on CIE IGCSE Physics 1.7.4 Power. Each one has a worked solution and a mark scheme showing where the marks go.

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