Chapters 9,10,&11 review Again, notes are recommended

Chap 9 stuff Explain the difference between linear speed and rotational speed. Explain the difference between rotation and revolution.

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?

And then… What kind of force gives rise to circular motion? What is the difference between centripetal force and centrifugal force?

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?

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?

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?

And then… How do you find the CoG of a regularly shaped object? How do you find the CoG of an irregularly shaped object?

And then… Give examples of three objects whose centers of gravity are not where there is any material.

And then… When will an object topple over?

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?

And then… How do tails help animals keep their balance?

And then… Why is the Seattle space needle stable?

And then… Explain how that crazy body bending way of clearing a high jump bar is, like, better.

And then… Why can you not stand on your toes when you are facing a wall?

And then… What is suggested by a star that wobbles off center?

And then… Why is a meter stick standing on end unstable but it’s stable when it hangs from one end?

And then… What happens to the CoG of a glass of water when a ping pong ball is pushed under the surface?

Chapter 11 stuff Define torque

And then… What two things can you do to increase torque?

And then… Explain the whole see saw thing with the balanced torques and stuff.

And then… What is newton’s first law? Explain the rotational form of newton’s first law.

And then… Why is it harder for a long-legged animal to move its legs fast than a short-legged animal?

And then… Explain rotational inertia

And then… What two factors influence rotational inertia?

And then… What does a gymnast do to rotate faster when performing a flip?