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PHY4A




Centripetal force theory

To make an object accelerate, there has to be an unbalanced force acting in the same direction as the
acceleration (Newton's first law). In the case of circular motion the unbalanced force is called the
centripetal force.

When a train travels around a bend, the centripetal…

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PHY4A




At the bottom of the circle:

The person feels heavier than usual as the size of the normal reaction force is equal to the
person's weight plus the centripetal force required to maintain circular motion.

At the top of the circle:

The person may feel lighter than usual as…

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