Physics Chapter 12 Test (From Q40).pdf

Physics Chapter 12 Test (From Q40).pdf - Name Class Date ID...

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Name: ________________________ Class: ___________________ Date: __________ ID: A 1 Rotational Mechanics - REVIEW ____ 1. Where is the center of gravity of a softball bat located? a. Exactly halfway along the bat b. In the thin handle c. In the more massive end of the bat ____ 2. When a wrench is slid spinning over a frictionless tabletop, its center of gravity follows a. a regular straight-line path. b. a wobbly path with irregular speed. c. a straight-line path with irregular speed. ____ 3. An object will fall over if its center of gravity is a. outside the object. b. too low. c. not over its area of support. d. too high. ____ 4. When you carry a heavy load with one arm, why do you tend to hold your free arm away from your body? a. To change the mass of your body b. To be ready to grab something in case you fall c. To look good d. To change the center of gravity of your body and the load e. To change the weight of your body and the load ____ 5. If an object is in unstable equilibrium, any displacement will a. raise its center of gravity. b. increase its mass. c. neither raise nor lower its center of gravity. d. lower its center of gravity. e. decrease its mass. ____ 6. If an object is in stable equilibrium, any displacement will a. raise its center of gravity. b. neither raise nor lower its center of gravity. c. decrease its mass. d. increase its mass. e. lower its center of gravity. ____ 7. If an object is in neutral equilibrium, any displacement will a. raise its center of gravity. b. decrease its mass. c. increase its mass. d. neither raise nor lower its center of gravity. e. lower its center of gravity.
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Name: ________________________ ID: A 2 ____ 8. If you try to touch your toes while standing flat against a wall, you probably will fall over. The reason this happens is that a. your center of gravity is not located directly above your support area. b. your center of gravity is outside your support area. c. both A and B ____ 9. The center of mass of a human body is located at a point a. that changes as a person bends over. b. that is fixed, though different for different people. c. that is always directly behind the belly button. d. none of the above ____ 10. An object thrown into the air with a spin rotates about its a. geometric center. b. center of gravity. c. edge. d. midpoint. e. none of the above ____ 11. A fish suspended in water is in what kind of equilibrium? a. Neutral b. Stable c. Unstable ____ 12. A ball resting on the floor is in what kind of equilibrium? a. Neutral b. Stable c. Unstable ____ 13. A picture hangs on a wall from a wire that is passed over a supporting nail. The picture is in stable equilibrium because a. its center of gravity is directly below the supporting nail. b. any slight push will raise its center of gravity. c. after any small push, it will return to its original position. d. all of the above ____ 14. Based on stability concepts, you would expect a very broad tree to have a. exceptionally strong roots.
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