10 minutes maximum! Can you do it in 5?

1. Which one of these is the correct formula for momentum?
 A. momentum = mass x acceleration^{}
 B. momentum = mass ÷ acceleration^{}
 C. momentum = mass x velocity
 D. momentum = mass ÷ velocity
 
24: What are the missing values in this table showing the momentum of different sports balls? 



mass 
velocity 
momentum 
2. 
Basketball 
1.5 kg 
6 m/s 
kg m/s 
3. 
Tennis ball 
200 g 
m/s

2 kg m/s 
4. 
Netball 
kg

3 m/s 
16 kg m/s 

5. When 2 objects collide, they follow " the law of conservation of momentum" . This law states that..
 A. "The total momentum before and after a collision is the same if no external force acts on the system".
 B. "The total momentum before and after a collision is always the same".
 C. "The total momentum before and after a collision is always zero".
 D. "The total momentum of any system is always zero".
 
Q610. To investigate the law of conservation of momentum, 2 'trolleys' (blocks of wood on wheels) were collided together. The trolleys have magnets on top so they stick together after the collision.
Trolley A is moving at 1.2 m/s towards B, which is stationary.


6. What is the momentum of trolley A before the collsion?
 A. 2.5 kg m/s
 B. 5.0 kg m/s
 C. 6.0 kg m/s
 D. 9.6 kg m/s
 
7. What is the total momentum of both trolleys after the collision once they are stuck together?
 A. 3.0 kg m/s
 B. 3.6 kg m/s
 C. 6.0 kg m/s
 D. 9.6 kg m/s
 
8. What is the speed of both A+B (stuck together) after the collision?
 A. 0.75 m/s
 B. 1.2 m/s
 C. 3.0 m/s
 D. 6.0 m/s
 
The formula here (in two different forms) can be used to find the force needed to change the momentum of a system. 

9. If trolley A was pushed for 0.5 seconds to get it moving to 1.2 m/s at the start, how much force was applied?
 A. 0.6 N
 B. 2.4 N
 C. 6 N
 D. 12 N
 
10. During the impact, trolley A pushes on B, so trolley B pushes back on A.
This is a simple example of....
 A. Newton's First Law.
 B. Newton's Second Law.
 C. Newton's Third Law.
 D. Newton's Fourth Law.
 
