Calculating Net Force on Mass m2

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Discussion Overview

The discussion revolves around the calculation of the net force on mass m2 in a system involving pulleys and ropes. Participants explore the conditions under which the net force could be considered zero, examining the mechanics of the setup and the implications of friction.

Discussion Character

  • Exploratory, Technical explanation, Debate/contested

Main Points Raised

  • Some participants question how the net force on mass m2 can be zero, suggesting a need for clarification on the problem setup.
  • Others describe the mechanics of the pulleys and the angles at which forces are exerted, indicating that the configuration may lead to a balanced force situation.
  • One participant asserts that if there is no friction between masses m1 and m2, the net force on m2 will indeed be zero, referencing another participant's post for further details.
  • There is a suggestion to list all forces acting on m2 to better understand the situation, acknowledging the role of the pulleys in the force dynamics.

Areas of Agreement / Disagreement

Participants express differing views on the net force on m2, with some asserting it is zero under certain conditions while others seek clarification and express confusion about this conclusion. The discussion remains unresolved regarding the implications of the forces involved.

Contextual Notes

There are limitations in the discussion regarding assumptions about friction and the specific configuration of the pulleys and ropes, which may affect the net force calculation.

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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