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Circular Motion
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Which horse on a merry-go-round moves faster…
One on the outside rail One near the inside rail?
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Or…how about a turntable?
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More than one kind of speed…
Linear speed (velocity) Distance time Greater for outside horse AKA tangential speed Rotational speed (velocity) # of rotations per unit of time Same for all horses AKA angular speed
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Interesting application…
Rims of train wheels are tapered
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Washer on a string… The washer’s speed does not change, but its velocity does Centripetal acceleration
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What would Isaac say? Newton’s 1st Law Newton’s 2nd Law
Force needed to cause an acceleration
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A new force… Centripetal force – force that causes an object to follow a circular path
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What’s wrong with this picture?
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Be careful… Centripetal force sometimes called “centrifugal” force
A “fictitious” force
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Quick Check… What is the direction of the force that acts on clothes in a washing machine? a. outward b. inward C. up D. down
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If you whirl a tin can on the end of the string and the string suddenly breaks, the can will ______________. A. fly directly away from you b. fly directly toward you c. fly off, tangent to its circular path d. spiral away from your hand e. spiral in toward your hand
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Which has the greatest angular speed – the horse on the inside or the outside of the merry-go-round? Or is this a trick question?!!
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