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Chapters 9,10,&11 review
Again, notes are recommended
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Chap 9 stuff
• Explain the difference between linear speed and rotational speed.
• Explain the difference between rotation and revolution.
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And then…
• Two ladybugs are on a turntable. One is at the edge and the other is 1/3 of the way out from the center. How much faster does one on the edge travel than the other?
• Which part of the earth’s surface has the greatest rotational speed?
• Which part has the greatest linear speed?
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And then…
• What kind of force gives rise to circular motion?
• What is the difference between centripetal force and centrifugal force?
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And then…
• Why does the water not fall out of the bucket when Dr. Mason swings it overhead?
• You are whirling a rock overhead on a string. If the string breaks, will the rock fly off in a straight line path because of centripetal force, centrifugal force or lack of force?
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And then…
• A bug is at the bottom of a can that is being whirled overhead. There is an action/reaction pair of forces between the bug and the can. Which of these is the centripetal force and which is the centrifugal force?
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Center of gravity stuff
• Define center of gravity• The complicated motion of a thrown baseball
bat can be reduced to what two kinds of motion?
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And then…
• How do you find the CoG of a regularly shaped object?
• How do you find the CoG of an irregularly shaped object?
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And then…
• Give examples of three objects whose centers of gravity are not where there is any material.
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And then…
• When will an object topple over?
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And then…
• Why can you not stand with your heels and back to the wall and bend over to touch your toes without falling over?
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And then…
• How do tails help animals keep their balance?
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And then…
• Why is the Seattle space needle stable?
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And then…
• Explain how that crazy body bending way of clearing a high jump bar is, like, better.
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And then…
• Why can you not stand on your toes when you are facing a wall?
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And then…
• What is suggested by a star that wobbles off center?
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And then…
• Why is a meter stick standing on end unstable but it’s stable when it hangs from one end?
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And then…
• What happens to the CoG of a glass of water when a ping pong ball is pushed under the surface?
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Chapter 11 stuff
• Define torque
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And then…
• What two things can you do to increase torque?
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And then…
• Explain the whole see saw thing with the balanced torques and stuff.
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And then…
• What is newton’s first law?• Explain the rotational form of newton’s first
law.
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And then…
• Why is it harder for a long-legged animal to move its legs fast than a short-legged animal?
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And then…
• Explain rotational inertia
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And then…
• What two factors influence rotational inertia?
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And then…
• What does a gymnast do to rotate faster when performing a flip?