# Physics-Circular Motion AQA

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• Created by: lilly liu
• Created on: 14-10-12 20:01
What is Circular Motion
Objects moving in a circle with a constant speed must have a force acting on it, directed towards the centre of the circle. This is the centripetal force.
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What is needed to create a centripetal force?
A resultant forced is needed (to create an acceleration).
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Factors affecting the centripetal force
Force, mass & acceleration F=MA
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The amount of centripetal force needed to keep an object in a circle depends on:(Mass)
...the greater the mass, the larger the force needed
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The amount of centripetal force needed to keep an object in a circle depends on:(Speed)
...the higher the speed, the larger the force needed
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The amount of centripetal force needed to keep an object in a circle depends on: (Radius of the Circle)
...the smaller the cirlce, the larger the force needed
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For cars the centripetal force is created...
...by the friction between the tyres and road surface
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(More on Cars) as the car travles at a constant speed, the forward and backward forces are balanced however....
....as it accelerates there is still a resultant force acting on it. This acts at right angles to the direction in whcih the car is driving
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## Other cards in this set

### Card 2

#### Front

A resultant forced is needed (to create an acceleration).

#### Back

What is needed to create a centripetal force?

### Card 3

#### Front

Force, mass & acceleration F=MA

### Card 4

#### Front

...the greater the mass, the larger the force needed

### Card 5

#### Front

...the higher the speed, the larger the force needed