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![]() Well, note that both have different chosen axis. In one case there is obviously no forces acting upon the ball and in the second there obviously must be. The two scenarios appear to be in contradiction. The obvious conclusion here would be that there must be some unkown force acting upon the ball to change the tangential velocity into a radial velocity. And on further analysis, as time progresses and the ball gets farther and farther away, the tangential velocity becomes zero and the ball aquires only radial velocity. On the otherhand, one could also argue that since the radial distance from ball to the centre is changing, there MUST be a radial velocity. Since there is no force acting on the ball to change either velocity that must be the case, and vice versu. ![]() One could argue that a rotating ball moving off tangentially when the string breaks has the same radial and tangential velocities along the path as the ball did when the string broke. This is standard terminology.Īs a sidenote, that leads me to address that the viewpoint of the observer or setup of the axis is important, and if not chosen correctly can lead to some bizarre intepretations. There is clearly a radial component to the velocity of the puck if it is not traveling in a circle it's distance from the origin is not constant in time. In the same way 'restoring' means resultant in relation to SHM agree with Tanya.'centripetal' means resultant (net) force in relation to circular motion. I have made similar demonstrations to show some aspects of circular motion but not exactly as I have described here.must now do it !! There is then only 1 effective friction force.radial and it would be the centripetal force. I could arrange a radial, vertical arm fixed to the table so that the arm will make contact with the ball, if the vertical wall of the arm was covered in some friction material (sandpaper?) so that the force of friction between the ball and the arm was great enough to prevent sliding along the wall then the ball would rotate in circular motion on the table. As the table rotates there is effectively no (very little) friction between the ball and the table so the table will rotate underneath the ball. If I had to demonstrate the effect I can imagine a turntable with a ball bearing on the table. It means that the resultant friction force is at some angle between the radial direction and the tangential direction.Ī good analogy is a car turning in a circle, the centripetal force arises from some of the friction force being 'directed' towards the centre by turning the steering wheel to turn the front wheels. With a rotating table this friction force is still present but some of the friction force now acts towards the centre.to provide the centripetal force. ![]() If you picture an object on a linear conveyor belt then there is a friction force keeeping the object in contact. There are 2 aspects to friction in this discussion.
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