Physics 311, Quiz #12

Question 1: Which of the following is conserved in a 2-D collision? Indicate all correct answers:

1. momentum in x-direction
2. momentum in y-direction
3. KE in x-direction
4. KE in y-direction

    Answer:  a,b: momentum in each direction

Question 2: Define "inelastic collision".

    Answer:  Any collision in which kinetic energy is not conserved.
             KE is often lost as objects deform or break during a collision.

Question 3: If there are no unbalanced external forces during a collision, then the center of mass of all he colliding objects must

1. be motionless
2. move with a constant velocity
3. move with a nonzero acceleration

    Answer:  b: move with a constant velocity

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