 Linear Speed increases when the distance from the center of the axis increases. Linear Speed increases when the rotational speed increases.

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 A force is required to maintain circular motion  Any force that causes an object to follow a circular path is called a centripetal force.  Centripetal means “center-seeking”

Gravitational force that holds the moon in orbit is a centripetal force

Electrical forces holding the electrons in orbit around the nucleus are centripetal forces

 When a car rounds a corner, the _____and _____ provide the centripetal force  tires  road

 If the tires are worn smooth, if the car is going very fast or the road is icy or oily, this friction force will not be available.  The car will not be able to move in a circle, it will try to go in a straight line and possibly go off the road.

1 2 Draw the direction it would travel if released at 1 and 2

1 2 The object would travel tangent to the circle in a straight line

 1) The ___ rotates at high speed during the spin cycle  2) The tub’s _______ exert force on the clothes, but the holes prevent the tub exerting the same force on the ______. 3) _____ allows the water to escape in a straight line.

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 “Centrifugal force” is a fictitious force - it is not an interaction between 2 objects, and therefore not a real force.  Nothing pulls an object away from the center of the circle.

 What is erroneously attributed to “centrifugal force” is actually the action of the object’s inertia - whatever velocity it has (speed + direction) it wants to keep.

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