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Unformatted text preview: 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. Quiz Qn. 1 When you go around a circle, the total angle covered is: 1. 0 degrees 2. 180 degrees 3. 360 degrees 4. 90 degrees Will he catch the turtle? He can reach out 1m. r Reference line s Angleangular position Circumference/r = 2 Conversion: rad to degree A). Definition 1 revolution: 1 rad = 360/2 Counterclockwise " +" . Clockwise (decreasing ) "" The Sun The Moon =s/r= =s/r= 0.5 0.5 Total solar eclipse =93,000,000 mi =240,000 mi =2,160 mi =864,000 mi Example Average angular velocity = angular displacement/elapsed time avg = / t = (  )/(tt ) Angular Velocity =  Angular Displacement Angular Acceleration Example A floating volleyball serve To make a volleyball serve float, the server has to spin the ball for a fraction of a second, a good example of aerial dynamics. The ball goes from 1 = 0 rad/s to 2 = 1.0 rad/s during t = 0.1 s. Find . Angular Linear v 2 = v 2 +2 ax (with comparison to 1D linear kinematics) 7.2 The Equation of Rotational Motion Example = 36.0 rad/s, = 34.2 rad/s, t = 0.595 s =3.03 rad/s 2 How many revolutions does the ball make before being caught?...
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This note was uploaded on 01/02/2010 for the course PHY 101 taught by Professor Pralle during the Fall '08 term at SUNY Buffalo.
 Fall '08
 pralle

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