Vertical Circular Motion

  • Thread starter rachael
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  • #1
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7 A body of mass 0.40 kg is whirled in a vertical circle on
the end of a cord of length 0.40 m. If the tension in the
cord is 0.80 N when the body is at its highest point,
find:

b the acceleration and the speed of the mass at the
lowest point
c the tension in the cord at the lowest point.

How would you find the velocity for part b?
Would you use mv^2/r=F-mg if not what do i use?
for part c what do i use to find the tension at the lowest point?Do i use the same formula as well for b?
 

Answers and Replies

  • #2
Hootenanny
Staff Emeritus
Science Advisor
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6
Yes, you can work out the net force acting (which will always be towards the centre of the circle) and then apply Newton's law.
For part c you already know the centripetal force (you would have worked it out in a), then draw a diagram of all the forces acting when the body is at the bottom of the circle.
 
  • #3
55
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thank you............
 

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