SG_Chap7 - 7.1 Rotational Motion and Law of Gravity Smooth,...

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Page 1 7.1 Rotational Motion and Law of Gravity Smooth, circular objects Will he catch the turtle? He can reach out 1m. Kinematics in circles displacement x is the same for everyone. x x x A. Linear motion: B. Rotational motion Reference line angle is the same for everyone, while linear distances and speeds are not. θ
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Page 2 Will he catch the turtle? He can reach out 1m. r ) : ( rad unit radius length arc r s Reference line θ s Angle -angular position Circumference/r = 2 Conversion: rad to degree A). Definition 1 revolution: 360 ) ( 2 2 rad r r r s 1 rad = 360°/2π Counter-clockwise " +" . Clockwise (decreasing θ) "-" The Sun The Moon θ=s/r= θ=s/r= 0.5° 0.5° Total solar eclipse =93,000,000 mi =240,000 mi =2,160 mi =864,000 mi Example
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Page 3 Average angular velocity = angular displacement/elapsed time avg = / t = ( - 0 )/(t-t 0 ) Angular Velocity = - Angular Displacement Average angular acceleration = change in velocity / elapsed time avg = ( f - 0 )/(t - t 0 ) = w / t Angular Acceleration
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SG_Chap7 - 7.1 Rotational Motion and Law of Gravity Smooth,...

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