Homework2_solutions

# Homework2_solutions - Homework 2 Solutions Chapter 2 Review...

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Homework 2 Solutions Chapter 2 Review Questions 1. 70 lbs. to the right 2. It has magnitude and direction 3. 0 N, it is in equilibrium 4. 0 N, it is in equilibrium 5. The net force on it is 0 N, and the inertial state is not altered 6. 15 N, 0 N 7. Bad question, I believe that they mean to say: initially push with a force of 100 N and then let go. If it continues at the same velocity (and air resistance is not present), frictional force is 0 N. 8. Inertia. If everything around us is in same-constant inertial state, it will not feel like we are moving. Like being on a train or plane that has a constant velocity. Ranking Questions 9. D, B. A, C 10. A) No force is needed to keep either of them moving. B) C, B, A Exercises 11. Inertia. If the earth was revolving around the sun, Aristotelian philosophy taught that we should have the constant sensation of motion. 12. He showed that a ball in motion will remain in motion if it does not travel against gravity and remains on a frictionless surface. 13. “Inertia” is a name given to the process by which objects fail to accelerate in the absence of an external net force. It is actually a constant linear velocity, which becomes angular velocity as the force of gravity acts on the earth. This force of gravity must be in equilibrium with the hypothetical centrifugal force, which is a function of angular velocity. 14. Maximum net force occurs when both are in the same direction: 32 N. Minimum is when they are in a 180 degree opposite direction: 8 N. 15. No, a constant net gravitational force is acting upon it. Zero velocity is only a feature of equilibrium force when the object is not accelerating (or decelerating, in this case). 16. No net force. You can apply an equal force to opposite sides of an object and it will not move. 17. When the rope is attached to his swing, the pulley acts to distribute his weight to both lengths of the rope. This creates a mechanical advantage of 2, half the force is needed at either end to hold him up. Attached the pole, the pulley acts only as a redirecting pivot with no mechanical advantage. An equal force of tension is present in both lengths of the rope. 18. 800 N 19. 1) Force due to gravity 2) Force of the table on the book 20. Yes, the same as my weight. I don’t move because the forces are equal and opposite.

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21. They are equal, acceleration ceases. F net = ma = 0 N. 22. In your hand, you and the coin have the same forward velocity. In front of you, your forward velocity is less than the coin’s. If your turning left, it will be to your right and vice versa. The coin will keep going straight. 23. 1 x 10 9 24. 1 x 10- 9 25. 0.000000001 These problems from Chapter 2 should have been assigned, please review them. 26.
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## This note was uploaded on 12/04/2011 for the course PHYSICS 1025 taught by Professor Ramos during the Summer '11 term at Miami Dade College, Miami.

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Homework2_solutions - Homework 2 Solutions Chapter 2 Review...

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