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Physics - CIE
Motion, forces and energy - circular motion
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8 Terms
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1
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newtons first law of motion
a body remains at rest or uniform motion in a straight line unless acted upon an external force
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NOTE:
uniform motion = constant speed or velocity
unbalanced force = resultant or net force
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centripetal force
is the resultant force acting towards the centre of acicular path to keep it moving in a circle
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QUESTIONS
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5
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1. A car travels around a circular track at a constant speed.
(a) why is it incorrect to describe the circular motion as having a constant velocity
This is because according to newtons first law, constant velocity means the body is moving in a straight line
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(b) A force is required to maintain the circular motion.
(i) explain why a force is required
An external, unbalanced force is required to keep the body moving in a circle. The body must be accelerating to be able to to move in a circular path.
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(ii) In which direction does this force act
towards the centre of the circle path
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(iii) suggest what provides this force
the friction force between the tyres and the road
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