Transcript Photosynthesis Limiting Factors

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Circular Motion
Noadswood Science, 2013
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Wednesday, April 6, 2016
Circular Motion
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To know what circular motion is
Circular motion
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Circles
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Velocity is the speed and direction of an object – if an object
is travelling in a circle it is constantly changing direction
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This means the objects velocity is constantly changing (but
not its speed) so the object is accelerating
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The acceleration is towards the
centre of the circle
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Centripetal Force
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There must be a resultant force acting on the object causing
this acceleration – this force acts towards the centre of the
circle
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It is this force that keeps something moving in a circle –
centripetal force (this force could be due to tension, friction,
gravity etc…)
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Centripetal Force – Tension
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A bucket swung around your head has a centripetal force
from the tension in the rope
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If the rope were to break the bucket would fly off
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Centripetal Force – Friction
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A car going around a bend (part of a circle) experiences a
centripetal force towards the centre
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The force is from the friction between the tyres and the road
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Centripetal Force – Gravity
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A satellite which orbits the Earth experiences a centripetal
force due to gravity
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Centripetal Force
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What does centripetal force depend on?
 Mass
 Speed
 Radius of the circle
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Centripetal Force – Mass
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The larger the mass of an object the bigger the centripetal
force has to be to keep it moving in a circle
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Centripetal Force – Speed
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The faster an object is moving the bigger the centripetal
force has to be to keep in moving in a circle
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Centripetal Force – Radius
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The smaller the circle the larger the force that is needed (it
has more ‘turning’ to do)