1. Momentum Anything which is moving has MOMENTUM. The amount of momentum it has depends on:- 1. MASS (kg) 2. VELOCITY (m/s)

2. Which of the following have momentum?

7. momentum = mass x velocity (kgm/s) (kg) (m/s) The formula for momentum is:-

8. Find the momentum of the following 1. 0.06 kg 30 m/s momentum = mass x velocity = 0.06 x 30 = 1.86 kgm/s

9. 2. 40 000 kg 20 m/s momentum = mass x velocity = 40 000 x 20 = 800 000 kgm/s

10. 3. 70 kg 1.5 m/s momentum = mass x velocity = 70 x 1.5 = 105 kgm/s

11. 4. 1000 kg at rest momentum = mass x velocity = 1000 x 0 = 0 kgm/s

13. Objects travelling in same direction 3 kg5 kg 10 m/s 5 m/s (3 x 10) + (5 x 5) 30 + 25 = 55 kgm/s

14. Objects travelling in opposite direction 4 kg6 kg 7m/s 2 m/s (4 x 7) - (6 x 2) 28 - 12 = 16 kgm/s

15. Objects travelling in opposite direction 8 kg 3kg 2m/s 5 m/s (8 x 2) - (3 x 5) 16 - 15 = 1 kgm/s

16. One object travelling towards an object at rest 10 kg 20kg 5m/s 0 m/s (10 x 5) + (20 x 0) 50 + 0 = 50 kgm/s +

17. CONSERVATION OF MOMENTUM total momentum before collision or explosion = total momentum after collision or explosion

18. TOTAL MOMENTUM BEFORE COLLISION = TOTAL MOMENTUM AFTER COLLISION

20. What is the velocity of the diesel and flatcar after the collision?

21. total momentum before = total momentum afterwards (18000 x 5) + 0 = 28000 x V 90000 = 28000 x V 90000 = V = 3.21 m/s 28000 Mass of diesel = 18000kg Velocity of diesel = 5m/s Mass of flatcar = 10000kg Velocity of flatcar before collision = 0m/s What is the combined velocity of the diesel and flatcar after the collision?

22. What is the combined velocity of car and van after the collision?

23. Momentum Before = Momentum afterwards (1000 x 20) + 0 = 5000 x V 20000 = 5000 x V 20000 = V = 4 m/s 5000 What is the combined velocity of car and van after the collision? Mass of car = 1000 kg Velocity of car = 20 m/s Velocity of van before collision = 0 m/s Mass of van = 4000kg

24. What is the combined velocity of car and van after impact?

25. Momentum before = Momentum afterwards (3000 x 20) – (1000 x 20) = 4000 x V 60000 – 20000 = 4000 x V 40000 = 4000 x V 40000 = V = 10 m/s 4000 Mass of car = 1000kg Velocity = 20 m/s Mass of van = 3000kg Velocity = 20 m/s What is the combined velocity of car and van after impact?