101103 - Physics 121 Physics 121 1 Physics 121 2 Physics 121 3 7.1 7.2 7.3 a 31 67 0 b 1 10 1 c 28 1 1 d 77 5 72 e 19 10 24 f 2 Prof E F Redish 1

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Physics 121 11/3/10 Prof. E. F. Redish 1 11/3/10 1 Physics 121 11/3/10 2 Physics 121 7.1 7.2 7.3 a 31% 67% 0% b 1% 10% 1% c 28% 1% 1% d 77% 5% 72% e 19% 10% 24% f 2% 11/3/10 3 Physics 121
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Physics 121 11/3/10 Prof. E. F. Redish 2 11/3/10 8 Physics 121 ± ± R R v ± t v v a ² t Similar triangles imply R v a R v v a v t a R t v 2 = = ± = ± 11/3/10 9 Physics 121 r R v a r R r r R v a ˆ ector position v of direction in r unit vecto ˆ ector position v center in to pointing 2 2 ± = = = = = ± ± ± 11/3/10 10 Physics 121
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Physics 121 11/3/10 Prof. E. F. Redish 3 11/3/10 11 Physics 121 r R mv F r R v m F r R v a m F a net net net ˆ ˆ ˆ 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. 11/3/10 12 Physics 121 R Position Velocity Acceleration ± R R v ± t ± v v a ± t R v a R v v a v t a R t v 2 = = ± = ± 11/3/10 13 Physics 121 x y ± t t ± ± = ± ± = = ² ³ ´ µ degrees) (in 360 2 radians) (in t ± = ± 0 Uniform motion:
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Physics 121 11/3/10 Prof. E. F. Redish
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This note was uploaded on 12/28/2011 for the course PHYSICS 121 taught by Professor Shawhan during the Spring '10 term at Maryland.

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101103 - Physics 121 Physics 121 1 Physics 121 2 Physics 121 3 7.1 7.2 7.3 a 31 67 0 b 1 10 1 c 28 1 1 d 77 5 72 e 19 10 24 f 2 Prof E F Redish 1

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