GCSE Physics Equation Sheet Energy Challenge

Question

8 marks

Answer all parts. Show your working and give units where appropriate.

1(a)

An electric winch raises

18 kg

of equipment vertically through

4.0 m

6.0 s

. Take the gravitational field strength to be

9.8 N k g^{- 1}

. The winch receives a total electrical input power of

250 W

. Calculate the increase in the gravitational potential energy of the equipment.

[2 marks]

1(b)

Calculate the useful output power of the winch while it raises the equipment.

[2 marks]

1(c)

Calculate the efficiency of the winch. Give your answer as a percentage.

[2 marks]

1(d)

The equation sheet also gives an efficiency relationship using useful energy output and total energy input. Explain why using energy values would give the same efficiency for the same

6.0 s

lifting interval.

[2 marks]

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