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GOALS
In this activity you will:
- Recognize that an object in motion remains in motion unless acted upon by a force — Newton's First Law.
- Explain how a force toward a fixed center will allow a car to travel in circular motion.
- Describe how the centripetal force is dependent on the speed and the radius of the curve and the mass of the object.
- Solve problems using the equation for centripetal force.
- Recognize that safety considerations limit the acceleration of a roller coaster to below 4 g.
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 What Do You Think?
The first looping coaster was built in Paris, France. It had about a 4 m (13 ft.) wide loop. One of the largest loops today is about 35 m (120 ft.) wide.
- Why don't you fall out of the roller coaster car when it goes upside down during a loop-the-loop?
Record your ideas about this question in your Active Physics log. Be prepared to discuss your response with your small group and the class.
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