Circular motion

  • Thread starter dranseth
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  • #1
dranseth
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Homework Statement




A toy with a mass of 100g is going through a loop-the-loop with a diameter of .5m. How fast must the car be moving at the top of the loop in order to not fall.




The Attempt at a Solution



At the top of the loop, there is a normal force (Fn) and the force of gravity (Fg). I'm not sure how to do this. Do I neglect one of the forces? Set one to zero, or what?
 

Answers and Replies

  • #2
Doc Al
Mentor
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What happens to the normal force when the car is just about to lose contact with the track?
 
  • #3
dranseth
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Fn approaches 0. Thanks.
 

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