L21-EX 21.2 Bar and Block_1

L21-EX 21.2 Bar and Block_1 - Now block Dont know a A use...

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The slender bar below has mass m and is pinned to a metal block of mass m A that rests on a smooth level surface. The system is released from rest in the position shown. What is the bar’s angular acceleration at the instant of release? Type of problem? Rigid Body Kinetics Next step? List unknowns – how many equations? a Gx , a Gy , A x , A y , α, a A , N -- 5 equations What can I do next? Kinematics! =0 Just algebra (8) into (1), then into (3), (7) into (2), then into (3), solve for
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Unformatted text preview: Now block Dont know a A use (1) and (4) to relate them. Given: Find: m, m A , released from rest of the bar First step? FBD, MAD Equations of motion do bar first (1) (2) (3) (4) (5) Released from rest, =0 (6) (7) (1) and (4) a Ax into (6) Do algebra to solve for a Gx - + = 2 cos l m m m A A (8)...
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This note was uploaded on 12/10/2009 for the course ME 212 taught by Professor Staff during the Spring '05 term at Cal Poly.

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