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Unformatted text preview: ⎝ ⎛ = × = ∑ ∑ i i i i M M i i total ( Total torque from weight : 1 Example: At what point does a 1 kg mass balance a 1 kg ruler? Weight of ruler Object = many point masses M i located at r i with respect to chosen origin: CM CG r r = Torque from weight acts at CM weight Ch 12: Static Equilibrium g y M g y M U i i i CM weight Total = = ∑ Total Gravitational Potential Energy: M = total mass CM weight Total y g M U = y CM Torque due to Weight : M H W O Example: Door of width W and height H Should we find torque about O by t F r ⊥ F d or (d = moment arm) ?...
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