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Published byJohn Gordon Modified over 2 years ago

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Circular Motion Uniform circular motion: examples include Objects in orbit (earth around the sunObjects in orbit (earth around the sun Driving a car around a cornerDriving a car around a corner Rotating a ball around on a stringRotating a ball around on a string

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Circular Motion According to Newtons mechanics, objects dont tend to move in a circle by themselves. They tend to either be at rest of move in a straight line at constant speed (this is Newtons first law)

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Circular Motion Circular motion is not natural motion Some (a Force) must make an object move in a circle The Force causing circular motion can be one of many different forces, depends on the situation (orbit = gravitational force, car turning a corner = frictional force, ball on a string = tension force)

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Circular Motion Remember from Newtons 2 nd law, that …..Force = mass x acceleration (F = ma) But if the object is in uniform circular motion, their speed is constant, so is acceleration = 0?

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Circular Motion In circular motion, the acceleration is a change in the direction of the object, even though the speed is constant, the direction keeps changing, and velocity is a vector. The force keeps pulling the object to the center, hence we call this type of acceleration centripetal acceleration which means center seeking.

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Circular Motion Solving circular motion problems is like a typical force problem where the motion is circular rather than linear. F = ma still works, now we have a new term for centripetal acceleration a c = v 2 /r acceleration (centripetal) = velocity squared/radius.

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