Physics 121 11/5/10 Prof. E. F. Redish 1 11/5/10 1 Physics 121 11/5/10 2 Physics 121 11/3/10 3 Physics 121 R Position Velocity Acceleration R R v t v v a t RvaRvvavtaRtv2 ===Physics 121 11/5/10 Prof. E. F. Redish 2 11/5/10 4 Physics 121 rRmvFrRvmFrRvamFanetnetnetˆˆ ˆ 222====always in order for the object to move in a circle with constant speed. Therefore, to do this, we need a net force. 11/5/10 5 Physics 121 =LR (in radians)whole circle=2RR= 2 raddeg=236011/5/10 6 Physics 121 x y tt === degrees)(in 3602 radians)(in t=0 Uniform motion:Physics 121 11/5/10 Prof. E. F. Redish 3 11/5/10 8 Physics 121 x y )(ˆ)sin(ˆ)cos(ˆˆ000ttjRiRjyixr+=+=+= What happens as t (and ) gets large (bigger than 2)? 11/5/10 9 Physics 121 -1.5-1-0.500.511.50 5 10 15 20 25thetasin(theta)-1.5-1-0.500.511.50 5 10 15 20
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