1. Momentum

2. –30 kg m/s. –20 kg m/s. –10 kg m/s. 10 kg m/s. 30 kg m/s.
The cart’s change of momentum is
–30 kg m/s.
–20 kg m/s.
–10 kg m/s.
10 kg m/s.
30 kg m/s.
STT9.1

3. –30 kg m/s. –20 kg m/s. –10 kg m/s. 10 kg m/s. 30 kg m/s.
The cart’s change of momentum is
–30 kg m/s.
–20 kg m/s.
–10 kg m/s.
10 kg m/s.
30 kg m/s.
STT9.1

4. An explosion in a rigid pipe shoots out three pieces
An explosion in a rigid pipe shoots out three pieces. A 6 g piece comes out the right end. A 4 g piece comes out the left end with twice the speed of the 6 g piece. From which end does the third piece emerge?
Left end
Right end
STT9.4

5. An explosion in a rigid pipe shoots out three pieces
An explosion in a rigid pipe shoots out three pieces. A 6 g piece comes out the right end. A 4 g piece comes out the left end with twice the speed of the 6 g piece. From which end does the third piece emerge?
Left end
Right end
STT9.4
This must be so in order for final momentum to match initial momentum of zero.

6. Objects A and C are made of different materials, with different “springiness,” but they have the same mass and are initially at rest. When ball B collides with object A, the ball ends up at rest. When ball B is thrown with the same speed and collides with object C, the ball rebounds to the left. Compare the velocities of A and C after the collisions. Is vA greater than, equal to, or less than vC?
vA > vC
vA = vC
vA < vC
STT9.3

7. Objects A and C are made of different materials, with different “springiness,” but they have the same mass and are initially at rest. When ball B collides with object A, the ball ends up at rest. When ball B is thrown with the same speed and collides with object C, the ball rebounds to the left. Compare the velocities of A and C after the collisions. Is vA greater than, equal to, or less than vC?
vA > vC
vA = vC
vA < vC
STT9.3
The total change in momentum must be zero in both cases. The ball has a larger change in momentum after hitting object C. C must have an equal and opposite change in momentum.