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- Thread starter sodr2
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Doc Al

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Ill go ahead and give you the question I have been working on:

A ladder which is 4 meters long masses 40 kg and has its centre of gravity 1.5 m up along its length, leans against a frictionless wall and rests on a frictionless floor. To keep it from slipping, it is tied to the wall with a rope which is attached to the ladder at its center of gravity.

and between the ladder and the rope is the center of gravity Fg [ down]

the angle is 53 degrees. Find all forces acting upon the ladder..

from here i am stuck...i could use tourque and put my pivot point on where the rope and gravity intersects, but then im left with the force of the floor [up] and the force of the wall

A ladder which is 4 meters long masses 40 kg and has its centre of gravity 1.5 m up along its length, leans against a frictionless wall and rests on a frictionless floor. To keep it from slipping, it is tied to the wall with a rope which is attached to the ladder at its center of gravity.

and between the ladder and the rope is the center of gravity Fg [ down]

the angle is 53 degrees. Find all forces acting upon the ladder..

from here i am stuck...i could use tourque and put my pivot point on where the rope and gravity intersects, but then im left with the force of the floor [up] and the force of the wall

...

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from here i am stuck...i could use tourque and put my pivot point on where the rope and gravity intersects, but then im left with the force of the floor [up] and the force of the wall...

Forces causes linear acceleration, torques cause angular acceleration. In this case, both net torque and net force need to sum to zero.

I'd start by drawing a diagram--in fact, it might help to just draw a regular free body diagram and ignore where the forces act (don't deal with torque). See if you can figure out any of the unknown forces from that.

- #5

Doc Al

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from here i am stuck...i could use tourque and put my pivot point on where the rope and gravity intersects, but then im left with the force of the floor [up] and the force of the wall...

Well, that's just

Here you have three unknown forces to find, so you need at least three equations. (Hint: Consider vertical and horizontal force components separately.)

Don't be stingy with the equations. No extra charge for using more than one!

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