A man pulls up a pulley shaft with force F (see the picture above)
Assume that the pulley and cord have no mass, and the mass of object 2 is bigger than the mass of object 1.
a) Determine the maximum normal force to make object 2 not moving.
b) Determine the tension force to make object 2 not moving
ΣF = ma[/B]
The Attempt at a Solution
a) The normal force is a reaction force, right ?
So, What I see that the object 2 gives the weight force to the floor. So, the normal force is m.g , right ?
But, my book says that the normal force is zero to make the object 2 not moving and it has no explanation at all.
b) My book says that the tension force equals to the weight of the object 2.
But, I think that there must be a fictional force (pseudo force) exerts on object 2 and also object 1 (because the force the man exerts on the shaft pulley will make the system go upward, and the blocks must have an additional force downward).
So, I think that the tension will be T = W2 - F
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