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Centrifugal reaction force
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Centrifugal Reaction Force at the Circus
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Read more about Centrifugal Force
Stopping the motorcycle/ball when it reaches the upper half of the circular track will cause it to fall off,
because of the lack of the centrifugal reaction force, which is proportional to the square of speed.
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<body face="Verdana">
At the Earth's surface, all object experience a downward force due to
gravity. Objects traveling in a circle also experience an outward
frictionous force with an inertial frame of reference, known as
centrifugal force. The motorcyle act at the circus is an example of
centrifugal force in action.
<p>
Imagine the ball were a motorcyce at the bottom of the cage. If the ball
starts with a speed that is high enough, it can pass the highest point
of the circular track without falling down, as if some kind of force
were holding it onto the track. However, if you increase the mass of the
ball, more speed is necessary to move the ball around the track. This
effect is called the centrifugal reaction force.
</p>
<p>
In fact, you may experience the centrifugal reaction force every day.
Have you ever felt as if you were being pulled out of the car or roller
coaster when going around a corner?
</p>
</body>
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16http://en.wikipedia.org/wiki/Centrifugal_force
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