Chapter 9 Answer Key: Conservation of Momentum
Chapter 9: Conservation of Momentum (Key)
9.2 Simple Collisions
1. (i) 0 Ns (before) 7160 Ns (after)(ii) 0 Ns in both cases
(iii) – 2.60 m/s (recoils at 2.60 m/s)
2. 0.4 m/s West
3. 0.0375 m/s opposite direction
4. 2.27 kg
5. 7.66 m/s
6. 556 m/s
7. 2.0 cm/s in original direction
8. 8.1 m/s
9. 10.5 m/s away from the end-zone
10. 0.0229 m/s or 2.3 cm/s
11. 280 m/s (roughly 1000 km/h)
12. 6.1 kg
13. 1.19 m/s same direction
14. 2.82 x 10-7 g
15. 0.17 m/s left
16. 11.3 m/s
9.3 Two Dimensional Collisions
1. 6.1 m/s 36° West of South
2. 23.5° West of North
9.4.1 Survival Rates of Seat Areas in an Airplane
• The passengers in the back would have a longer distance (?) to come to a stop, therefore the impulse is stretched over a longer time.
• The front of the aircraft acts like a crumple zone for the rest of the aircraft, similar to a front end collision of a vehicle.
• Other possible reasons?
9.4.2 Bullet Proof Vests
1. 0.050 m/s recoil
