Momentum Anything which is moving has MOMENTUM. The amount of momentum it has depends on:- 1. MASS...

Momentum

Anything which is moving has MOMENTUM.

The amount of momentum it has depends on:-

1. MASS (kg)2. VELOCITY (m/s)

Which of the

following have

momentum?

momentum = mass x velocity (kgm/s) (kg) (m/s)

The formula for momentum is:-

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

2. 40 000 kg

20 m/s

momentum = mass x velocity

= 40 000 x 20

= 800 000 kgm/s

3. 70 kg

1.5 m/s

momentum = mass x velocity

= 70 x 1.5

= 105 kgm/s

4.1000 kg

at rest

momentum = mass x velocity

= 1000 x 0

= 0 kgm/s

Objects travelling in same direction

3 kg 5 kg

10 m/s 5 m/s

(3 x 10) + (5 x 5)

30 + 25

= 55 kgm/s

Objects travelling in opposite direction

4 kg 6 kg

7m/s 2 m/s

(4 x 7) - (6 x 2)

28 - 12

= 16 kgm/s

Objects travelling in opposite direction

8 kg 3kg

2m/s 5 m/s

(8 x 2) - (3 x 5)

16 - 15

= 1 kgm/s

One object travelling towards an object at rest

10 kg20kg

5m/s 0 m/s

(10 x 5) + (20 x 0)

50 + 0

= 50 kgm/s

+

CONSERVATION OF MOMENTUM

total momentum before collision

or explosion =total momentum after collision or

explosion

TOTAL MOMENTUM BEFORE COLLISION = TOTAL MOMENTUM AFTER COLLISION

TOTAL MOMENTUM BEFORE COLLISION = TOTAL MOMENTUM AFTER COLLISION

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

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?

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

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

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

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/sMass of van = 3000kg

Velocity = 20 m/s

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