# Year 7 Science

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1.What are forces measured in and what is used to measure them?
They are measured in Newtons (N) using a newton meter
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2.What 5 things can forces make objects do?
Speed up, Slow down, Change direction, Turn, Change shape
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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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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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It limits top speed. The air resistance or drag takes most of your energy and also limits maximum speed
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## Other cards in this set

### Card 2

#### Front

2.What 5 things can forces make objects do?

#### Back

Speed up, Slow down, Change direction, Turn, Change shape

### Card 3

#### Front

3.What does air resistance do against objects moving in the air?

### Card 4

#### Front

4.Air resistance is what kind of force and why?

### Card 5

#### Front

5.What do things need to be to go fast and why?