Jill has entered a bike race. She knows that to go fast she needs to reduce the weight of her bike before the race, and use a higher gear during the race.
a) |
Using the idea of friction, explain how making the bike lighter would help Jill go faster in the race.
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b) |
Diagram 1 shows the gear size before Jill changed gear. When Jill changes gear only the rear cog changes.
In Diagram 2, draw the size of a rear cog that will allow Jill to pedal at the same speed but move faster.
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c) |
How does using a higher gear help Jill to go faster?
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