Name: PHYS 15200 Quiz Please show your work. Report your answers with correct si

Question

Name: PHYS 15200 Quiz Please show your work. Report your answers with correct significant figures and SI units. Fall 2017 (10/30/2017) Time Limit: 30 Minutes 1. (4 pt) In an INELASTIC collision between two objects (circle one)- (a) the momentum of each object is conserved (b) the kinetic energy of each object is conserved (e) the momentum of the system is conserved but the kinetic energy of the system is not conserved. (d) both the momentum and the kinetic energy of the system are conserved (e) the kinetic energy of the system is conserved, but the momentum of the system is not 2. (1 pt) In a perfectly ELASTIC collision between two perfectly rigid objects (circle one) (a) the momentum of each object is conserved. (b) the kinetic energy of each object is conserved. (e) the momentum of the system is conserved but the kinetic energy of the system is not conserved. (d) both the rmomentum and the kinetic energy of the system are conserved. (e) the kinetic energy of the system is conserved, but the momentum of the system i not conserved. 3. (1 pt) In a collision between two objects having unequal masses, how does the magnitude of the impulse imparted to the lighter object by the heavier one compare with the magnitude of the impulse imparted to the heavier object by the lighter one? (circle one) (a) The lighter object receives a larger magnitude impulse. (b) The heavier object receives a larger magnitude impulse. (c) Both objects receive the same magnitude impulse. (d) The answer depends on the ratio of the masses. (e) The answer depends on the ratio of the speeds. 4 (1 pt) A baseball is thrown vertically upward and feels no air resistance. As it is rising (a) both its momentum and its total mechanical energy are conserved. (b) its momentum is not conserved, but its total mechanical energy is conserved (e) both its momentum and its kinetic energy are conserved (d) its kinetic energy is conserved, but its momentum is not conserved. (e) its gravitational potential energy is not conserved, buts its momentum is conserved 5. (1 pt) A small car has a head-on collision with a large truck. Which of the following statements concerning the magnitude of the average force due to the collision is correct? (circle one) (a) The truck experiences the greater average force. b) The small car experiences the greater average force. (c) The small car and the truck experience the same average force. (d) It is impossible to tell since the masses are not given. (e) It is impossible to tell since the velocities are not given page 1 of 4

Explanation / Answer

In an ineslatic collision momentum of the system is conserved but not the KE

so the option - C is correct.

(2) Elastic collision is defined as the one in which there is no loss of KE in the collision

so the momentum and KE are totally conserved.

Option - D

(3) Both the objects receive same impulse - C

(4) Option - B

momentum is not conserved because an outside force of gravity is acting on the ball and changing the momentum

Mechanical energy = KE+PE

(5) Option - C

Newton's third law of motion states "when body A exerts a force on B equal and opposite force acts on A due to B"

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