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3 Conservation of energy

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Question 68
H

A cyclist freewheels down a hill without pedalling.

The total mass of the cyclist and bicycle is 80 kg. The speed at the top of the hill is 4.0 m/s. The speed at the bottom of the hill is 12 m/s.

The vertical height of the hill is 15 m.

Gravitational field strength (ggg) = 10 N/kg

a.

Calculate the decrease in gravitational potential energy of the cyclist and bicycle.

[2]
b.

Calculate the increase in kinetic energy of the cyclist and bicycle.

[3]
c.

Calculate the energy dissipated as the cyclist moves down the hill.

[1]
d.

Calculate the speed the cyclist would have at the bottom of the hill if no energy were dissipated.

[3]
e.

Suggest one reason why the energy dissipated is greater when the cyclist sits upright than when she crouches low over the handlebars.

[1]
Markscheme

3 Conservation of energy Questions

  1. GCSE
  2. /Physics
  3. /3 Conservation of energy

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