3.What does air resistance do against objects moving in the air?
It pushes or drags it
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4.Air resistance is what kind of force and why?
a frictional force because it slows objects down
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5.What do things need to be to go fast and why?
Streamlined or aerodynamic because they can slip through the air without much resistance
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6.Name a good thing about friction
Friction allows tyres to grip the road surface - without this grip you couldn't make a bike move forwards and you couldn't stop it either.
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6.Name another good thing about friction
Friction acts as the brakes where they rub on the rim of the wheel
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6.Name another good thing about friction
Friction allows you to grip a bike so you won't slip off
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6.Name one last good thing about friction
It holds all the nuts and bolts of a bike together
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7.Name a bad point about friction
It wastes energy - the transfer of energy from a rider's legs to the wheels isn't perfect - friction between moving parts warms up the gears and bearings - a waste of energy
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7.Name one last bad thing about friction
It limits top speed. The air resistance or drag takes most of your energy and also limits maximum speed
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