101101 - R v a R v v a v t a R t v 2 = = = Physics 121...

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Physics 121 11/01/10 Prof. E. F. Redish 1 11/01/10 1 Physics 121 *playing the original cover by Tom Rush 11/01/10 2 Physics 121 11/01/10 3 Physics 121
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Physics 121 11/01/10 Prof. E. F. Redish 2 11/01/10 Physics 121 4 11/01/10 8 Physics 121 t 1 t 2 t 3 t 4 t 5 t 6 R Period = time to go around once T = 4 ( t 3 t 1 ) (Why?) Speed = 2 ± R / T (Why?) t 7 t 8 11/01/10 9 Physics 121 t r v ± ± = ± ± t 1 t 2 1 r ± 2 r ± r ± ± 1 2 r r r ± ± ± ± = ² dt r d v ± ± =
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Physics 121 11/01/10 Prof. E. F. Redish 3 11/01/10 10 Physics 121 t 1 t 2 1 v ± 2 v ± v ± ± 1 2 v v v ± ± ± ± = ² t v a ± ± = ± ± dt v d a ± ± = 11/01/10 11 Physics 121 t 1 t 2 R ± ± ± 1 r ± 1 r ± 2 r ± 2 r ± 2 v ± 2 v ± 1 v ± 1 v ± v ± ± r ± ± 11/01/10 12 Physics 121 ± ± R R v ± t v v a ² t Similar triangles imply
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Unformatted text preview: R v a R v v a v t a R t v 2 = = = Physics 121 11/01/10 Prof. E. F. Redish 4 11/01/10 13 Physics 121 r R v a r R r r R v a ector position v of direction in r unit vecto ector position v center in to pointing 2 2 = = = = = 11/01/10 14 Physics 121 11/01/10 15 Physics 121 r R mv F r R v m F r R v a m F a net net net 2 2 2 = = = = always in order for the object to move in a circle with constant speed. Therefore, to do this, we need a net force. A(n inward) radial net force is needed to maintain circular motion....
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101101 - R v a R v v a v t a R t v 2 = = = Physics 121...

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