# 15notes - ο Translation rotation ο Use absolute and...

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Translation: body maintains same direction of motion all points on the body in translation have same velocity and acceleration rB=rA if rB/A is constant, same velocity and acceleration Rotation about fixed axis Particles move along curves and all the curves have a common center Same angular velocity and acceleration. What’s different is v and a Trace a circle around the axis no matter what

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Although the slippage force is equal and opposite on the two discs, the angular acceleration is not the same for A and B. This is because alpha depends on torque and inertia.

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General plane motion

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Unformatted text preview: ο Translation + rotation ο Use absolute and relative velocities Instantaneous Center ο§ If v and angular velocity is known then draw normal line to v ο§ If Va and Vb are not parallel and unknown β’ Draw normal lines to both velocities and find intersecting point ο§ If V and w are known β’ Then draw normal lines to both velocities lining them up β’ Draw second line joining tips of both velocities and find intersecting point Relative acceleration in plane motion οΆ Case 1: if alpha is give or determined easily example ο If alpha canβt be determined easily...
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15notes - ο Translation rotation ο Use absolute and...

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