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Edexcel | Physics WPH0 | S 16 4 1 | 1 hour 30 minutes
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15
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The photograph shows part of the cycling track used in the London 2012 Olympic

Games. On the bend the track is banked so that the outside of the track is higher than the

inside of the track.

The diagram shows the forces R and W acting on a cyclist travelling at a constant speed

around the bend.

15
(a)
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2 Mark s

Explain why there must be a resultant force acting on the cyclist.

Direction changing Or the velocity changes

Therefore (cyclist) accelerates

15
(b)
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2 Mark s

Explain why a banked track is an advantage to cyclists.

The horizontal component of reaction force acts towards centre of rotation

Or The horizontal component of R provides/contributes to the centripetal

force

The cyclist can go faster

15
(c)
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3 Mark s

An inflatable airbag helmet for cyclists has been designed to prevent head injuries.

It is worn like a scarf around the neck. In-built sensors detect when the cyclist is

involved in a crash and inflate the airbag over the cyclist’s head in 0.1 s.

The graph shows how the force on a cyclist’s head during a collision varies with time

when an airbag is not used.

Add to the axes, the graph that shows how the force on a cyclist’s head during a

collision varies with time when the airbag is used.

Justify the shape of your graph.

Graph drawn:

has a smaller maximum force

the change is over a longer time

Justification:

With airbag the rate of change of momentum is smaller

Or acceleration is smaller

Or Area(s) under graph(s) the same (accept impulse the same)

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