A question about rounded motion

  • #26
Doc Al
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there is a centrifugal force. and there is anti centrifugal that rope has on mass and gravity force.
Forget about centrifugal force--stick to an inertial frame.

The only forces acting on the mass are: the rope tension (which acts at an angle) and the weight (which acts down).

Since it's going in a horizontal circle, its acceleration is towards the center (centripetal) and horizontal.

So what must be the net vertical force on the mass?
 
  • #28
Doc Al
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Exactly!

Which means that the rope must pull up with a vertical force equal to the weight of the mass.
 
  • #29
ok. i get that well but what will be the total weight?
 
  • #30
Doc Al
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ok. i get that well but what will be the total weight?
You tell me!

If the man must pull upward on the rope with a vertical component of force equal to the weight of the mass, what must the scale read? Is this really any different from the case where he's just holding the mass without swinging it (as far as the scale reading goes)?
 
  • #31
oh! finally i understood. it will be the same cos man has to pull that weight. thanks very much you have very patience. you could just tell me the answer but you didn't. if you did i just take answer to the teacher but i learned now.
 

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