Calculating Net Force on Mass m2

AI Thread Summary
The discussion centers on understanding why the net force on mass m2 can be zero despite the presence of pulleys. When the rope is pulled, it exerts forces at 45 degrees, which are balanced by opposing forces from the pulleys. The absence of friction between masses m1 and m2 is crucial to this balance, confirming that the net force on m2 remains zero. Participants suggest analyzing all forces acting on m2, including those from the pulleys, to clarify the situation. The conclusion is that the net force being zero is indeed correct under the given conditions.
anigeo
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how can it be that the net force exerted on the mass m2 be zero?
 

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At least describe the problem a bit. And why you think the net force on m2 is zero.
 
anigeo said:
how can it be that the net force exerted on the mass m2 be zero?
Look at the pulleys and the position of the rope.

When you pull the rope, the rope will exert force 45 degrees down to the left by the upper pulley. The next pulley will counterforce with same force 45 degrees up to the right.

You could likely take away the pulleys and shorten the rope...and save some money.

Vidar
 
Doc Al said:
At least describe the problem a bit. And why you think the net force on m2 is zero.
because that is the answer and that's troubling me.could you say that it is incorrect?
 
anigeo said:
because that is the answer and that's troubling me.could you say that it is incorrect?
No, it's correct. Assuming there's no friction between m1 and m2, the net force on m2 will be zero. See Low-Q's post for details.

If you still have trouble seeing this, trying listing all the forces acting on m2. (Realize that the pulleys are attached to m2.)
 

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