- #1
a.mlw.walker
- 148
- 0
Hi, I am having trouble grasping an idea.
If you have a ball taped to a bit of string, and spin it above your head the ball will stay the radius away from your hand. If you spin faster and faster the "lack of centreptal force" - the centrefugal force will be greater than the force gluing the ball to the string and you reach the escape velocity?
What happens if the ball is held on a track and spinning so it can't move outwards because of a metal track but if it stopped it would fall inwards - like a ball on a roulette wheel. Surely the value of centrepetal force is not the reason it falls inwards in this example, because it is relative to the ball. There must be another force that the centreptal force of the ball must be greater than to keep it on the track (or in the example with ball on string, the centrepetal force must be greater than another force?)
What is this force - is it gravity F=mg. For both scenarios
If centreptal force falls below F = mg value, then ball will fall from the track?
Thanks
Alex
If you have a ball taped to a bit of string, and spin it above your head the ball will stay the radius away from your hand. If you spin faster and faster the "lack of centreptal force" - the centrefugal force will be greater than the force gluing the ball to the string and you reach the escape velocity?
What happens if the ball is held on a track and spinning so it can't move outwards because of a metal track but if it stopped it would fall inwards - like a ball on a roulette wheel. Surely the value of centrepetal force is not the reason it falls inwards in this example, because it is relative to the ball. There must be another force that the centreptal force of the ball must be greater than to keep it on the track (or in the example with ball on string, the centrepetal force must be greater than another force?)
What is this force - is it gravity F=mg. For both scenarios
If centreptal force falls below F = mg value, then ball will fall from the track?
Thanks
Alex