Name:______per.______

Conceptual Physics Chapter 9 & 12 Study Guide – UCM & ULG

Uniform Circular Motion & Universal Law of Gravitation

Essential Skills Questions:

  1. What direction does a centripetal force act? ______
  2. Give three examples of situations that have centripetal forces acting and name what is causing the centripetal force. ______

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  1. If a car travels around a corner at constant speed, does it have an acceleration? Explain. ______
  2. What new idea did Newton come up with relating an apple to the Moon? ______

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  1. Why did Newton think there was a force acting on the Moon? ______
  2. Explain what Newton Thought about the Moon with respect to falling, and tangential velocity. ______

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  1. What is tangential velocity? ______
  2. What equation did Newton figure for measuring Gravity? ______
  3. Explain the relationships in this equation between “G”, the “masses” and the “distance”______

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  1. What happens if one of the masses in the above equation is doubled? ______
  2. What happens if one of the masses in the above equation is halved? ______
  3. What happens if the distance between the objects in the above equation is doubled? ______
  4. What happens if the distance between the objects in the above equation is decreased? ______
  5. If the Moon were to stop moving, what would happen? ______
  6. If the Moon were to fall toward the Earth how would the force of gravity change as the moon got closer? Explain. ______
  7. If you were on the surface of the earth, standing on a tall ladder, or on top of Mt.Shasta, how would the force of gravity change for each location? ______

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  1. If there were a planet that had twice the mass of the Earth but it was many times larger, would the gravity of that planet be twice as great? Explain. ______
  2. The Inverse Square Law says that gravity: ______
  3. What is the force between two cars that are 5 meters apart, if one car’s mass 1000 kg and the other is

2000 kg. Write the original equation here: ______

Solve here:

______(answer)

STAR exam questions:

  1. When a car turns a corner at constant speed it has changing ______.
  2. What is the equation for measuring centripetal force? ______
  3. If Billy-Bob spins around holding a bucket that has a mass of 25 kg, at 2m/s, what force does he feel if the radius of his spin his 1m ?(show work) ______
  4. If he let’s go of the bucket while spinning, what direction will the bucket go? ______
  5. Tom’s Titanic Toy weighs 2 kg. If it travels 2 m/s what’s its momentum? ______
  6. What are Newton’s three Laws? 1) ______

2) ______3) ______

  1. King Kong pushes Sponge Bob with 1000N of force. Sponge Bob pushes back with ______
  2. George and Wanda are skating. George weighs 60 kg and is skating 4 m/s. He runs into and bear-hugs Wanda who is standing still and they both begin rolling at 1m/s. How much does Wanda weigh?(show work)______

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  1. Brenda and his cousin push his truck up a hill. If it requires and average force of 2000 N, and the hill is 30 m long, how much work does that take? ______
  2. Mr. Morrison got lost on the way to school today. He accidentally rode 15 miles the wrong way, which took him ¼ hour. He still made it back to school in time which took 15 more minutes. What was Mr. Morrison’s average speed on his bicycle? ______
  3. When Mr. Morrison got back to school he realized a seagull bomber was trying to poop bomb him from flight. As the poop dropped to the ground and missed (Mr. Morrison is an excellent rider and easily avoids poop bombs) he was able to count three seconds before the poop splatted. How high was the guilty gull? (show work) ______

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