10_1425_web_Lec_24_MoreStatics

10_1425_web_Lec_24_MoreStatics - More Statics Physics 1425...

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More Statics Physics 1425 Lecture 24 Michael Fowler, UVa
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Statics: Conditions for Equilibrium For any body, , the net force causes the CM to accelerate. Hence, if the body is remaining at rest, To eliminate angular acceleration, there must be zero torque about any axis. If all forces are in one plane, it’s enough to prove zero torque about one axis perpendicular to the plane: CM / i Mdv dt F = 0 i i F = 0 i i τ=
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Free Body Diagrams To apply Newton’s Laws to find how a body moves, we must focus on that body alone and add all the (vector) forces acting on it. The diagram showing all the forces on one body (or even part of a body) is called a “ free body diagram ”—we’ve “freed” the body from the rest of the system, representing everything else just by the forces on this body . The net (total) force then goes into . F ma Σ=
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Tips about Torques In statics, the net torque of the forces on a body is zero about any point: choose a
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This note was uploaded on 12/07/2011 for the course PHYSICS 1425 taught by Professor Michaelfowler during the Spring '10 term at UVA.

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10_1425_web_Lec_24_MoreStatics - More Statics Physics 1425...

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