FearOfPhysics.com: A Ball Tied to a String and Swinging round and round

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A Ball Tied to a String and Swinging round and round

This page deals with how objects behave that are moving in a circle. It uses a ball being twirled around on a string by an electric motor. The hand coming down from the top is holding a razor blade, and is about to abruptly cut the string. Take a look...

This video was difficult to make because the ball was spinning so fast. Here's a computer generated version of what we are trying to show you (the string is to be cut at the position of the white arrow):

Look carefully at the direction in which the ball is rotating, and the position where the string is about to be cut. The question for you is....

...When the string is cut, in which direction will the ball fly?

What do you think?Which direction will the ball go when the string is cut?

Right, in the red arrow's direction.

Down, in the green arrow's direction.

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