1. If a two-body collision is not head-on, then which of the following is always

Question

1. If a two-body collision is not head-on, then which of the following is always true? a. Momentum is conserved. b. Kinetic Energy is conserved. c. Neither a nor b is true. d. That a is true and b is not true. e. That b is true and a is not true.

2. When a catcher in a baseball game catches a fast ball, he does not hold his arms rigid, but relaxes them so that the mitt moves several inches with the ball while the ball is being caught. The action results in which of the following? a. The total impulse of the ball is made smaller. b. The average impact force is made smaller by increasing the time interval. c. By letting his hand move, the catcher’s hand receives less total momentum in stopping the ball. d. By letting his hand move, the catcher’s hand absorbs less total energy in stopping the ball. e. Both c and d result from his action.

3. A bomb free of outside forces is traveling north when it explodes into exactly three pieces. (Ignore any gas molecules from the explosion that go off in miscellaneous directions.) One piece continues to travel north, while another moves straight up relative to the ground. It is possible for the third piece to travel in a direction which is exactly a. North b. East c. Up d. Down e. South f. West

4. An object starts with a certain speed and slides with friction on a horizontal surface untilit comes to rest. Which of the following would double the amount of time that it takes for the object to come to rest. a. Doubling the mass of the object. b. Doubling the initial speed of the object. c. Doubling the coefficient of friction between the surface and the object. d. Either a or b would have that effect. e. None of the above would have that effect.

5. A totally inelastic collision is one where a. momentum is conserved, but kinetic energy is dissipated as much as possible. b. momentum is conserved, kinetic energy is dissipated, but not the maximum possible. c. momentum is conserved and kinetic energy is conserved. d. kinetic energy is conserved, but momentum is dissipated as much as possible. e. kinetic energy is conserved, momentum is dissipated, but not the maximum amount possible. f. neither kinetic energy nor momentum is conserved.

6. A partially inelastic collision is one where a. momentum is conserved, but kinetic energy is dissipated as much as possible. b. momentum is conserved, kinetic energy is dissipated, but not the maximum possible. c. momentum is conserved and kinetic energy is conserved. d. kinetic energy is conserved, but momentum is dissipated as much as possible. e. kinetic energy is conserved, momentum is dissipated, but not the maximum amount possible. f. neither kinetic energy nor momentum is conserved.

Explanation / Answer

we know that momentum is always conserved so option "a" will always be true

we also know total energy is always conserved but here it is mentioned about kinetic energy which may or may not be always conserved as energy may transformed from one form to another

so a) Momentum is conserved is always true

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