101105-opp - 11/5/10 Physics 121 1 11/5/10 Physics 121 2 R...

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Unformatted text preview: 11/5/10 Physics 121 1 11/5/10 Physics 121 2 R Position Velocity Acceleration at R vt v R vt at = R v 11/3/10 av = vR Physics 121 v 2 v a= R 3 net F always a= m 2 v in order for the object to move ˆ a= r in a circle with constant speed. R F net v2 Therefore, to do this, ˆ = r we need a net force. m R mv 2 net ˆ F= r R 11/5/10 Physics 121 4 L = R whole circle 11/5/10 (in radians) rad 2R = =2 R Physics 121 deg 2 = 360 5 y 2 (in radians) = (in degrees) 360 = t Uniform motion: 11/5/10 = x t = 0 Physics 121 t 6 ˆj ˆ r = xi + yˆ = ( R cos )i + ( R sin ) ˆ j = 0 + 0 (t t0 ) y x What happens as t (and ) gets large (bigger than 2 )? 11/5/10 Physics 121 8 1.5 sin(theta) 1 0.5 0 -0.5 0 5 10 15 20 25 -1 -1.5 theta 1.5 cos(theta) 1 0.5 0 -0.5 0 5 10 15 20 25 -1 -1.5 theta 11/5/10 Physics 121 9 ...
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101105-opp - 11/5/10 Physics 121 1 11/5/10 Physics 121 2 R...

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