1) Give the conditions for the equilibrium of an extended object.(adsbygoogle = window.adsbygoogle || []).push({});

An extended object is at equilibrium when no force is acting on it.

2) A uniform ladder of length 6.0m and mass 12.0kg is placed against a smooth vertical wall. The ground is rough.

a) Calculate the force on the ladder from the wall.

vertical forces = 0 = N1- W

so N1 = 117.72

horizontal forces = 0 = F - N2

Total Torque = 0

0 = F(0) + N1(0) + (12*9.81*cos60*(6/2)) - (N2sin60(6))

so,N2= 33.98 Newtons

b) Find the minimum coefficient of friction of the ground.

F - 33.98 = 0 ---> F=33.98

friction > F1/N1

so, coefficient of friction=33.98/117.72 ---->0.289

Are my answers correct? If not, what did I do wrong. Please help. Thanks!

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# Homework Help: HELP: Equilibrium & Torque

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