# Lecture04 - Racquetball Striking a Wall Circular and...

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Circular and General Physics I Mechanics Racquetball Striking a Wall Relative Motion Physics 140 Mt. Etna Stewart Hall

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Parallel and perpendicular components Parallel component changes speed Perpendicular component changes direction ( curved path = = acceleration !)
Uniform Circular Motion • Motion in a circle with constant speed • Even though the speed is constant, the elocity ector a r v r v r a r velocity vector is changing – namely, it is rotating • Acceleration is always perpendicular to the path and directed towards the center of the circle v r a r v r a r

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Uniform Circular Motion s v v R s v v = = r r The magnitude of the acceleration: R v R v t s R v t v a t t = = = 0 0 lim lim r R v a a rad 2 = =
Centripetal Acceleration “Centripetal” means “center seeking” Magnitude is always constant and equal to R v a a rad 2 = = Direction is always towards the center of a circle

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Other Characteristics of Uniform Circular Motion Period T – time to complete one revolution [s] 2 2 4 2 R v a R v rad π = = = Frequency f – number of revolutions per unit of time [Hz = 1/s] 2 T R T 2 2 2 4 2 1 Rf R v a Rf v T f rad = = = =
Merry-Go-Round Ride • A boy and a girl ride on a merry-go-round. The

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Lecture04 - Racquetball Striking a Wall Circular and...

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