| 3. A person twirls a key chain in a circle. If she twirls it faster, she finds that she holds the chain tighter. Explain why this is necessary. 4. It's a cold night and the roads are icy. If your car is filled with friends, will it be easier or more difficult to make a turn? Explain why. 5. In the equation for circular motion  explain what each of the terms represents.6. A roller coaster car is traveling east at 20 m/s. After 2 s, it is traveling north at 20 m/s.
8. A roller coaster car is traveling in a loop. Identify the six force vectors in the diagram below.  9. In explaining circular motion, someone correctly states that the centripetal force is a name for a force, but it is not an additional force. Explain what this means. |
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