1. Why can’t it stop easily ??
HARD TO STOP
2. It is FAST
1. It is MASSIVE
IT has a lot of MOMENTUM
John Parkinson

2. MOMENTUM
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3. MOMENTUM =
MASS
VELOCITY X
p = m v
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4. UNITS of MOMENTUM Mass x velocity = kg x m s-1 = kg ms-1 ©
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5. m = 150 000 tonnes v = 25 knots = 12.5 m s-1 p = ?
kg x 12.5 ms-1
= kg ms-1
QM2
= x 109 Kgm/s
m = 650 kg
v = 200 mph = 89 m s-1
p = ?
650 kg x 89 ms-1= kg ms-1
Ferrari F1
= x 104 Kgm/s
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6. THE PRINCIPLE OF CONSERVATION OF MOMENTUM
The total MOMENTUM of a system
is CONSERVED,
providing no external forces are acting on it.
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7. VECTORS H A V E
MAGNITUDE A N D D I R E C T I O N

8. Note that the 4 kg ball was moving to the left initially
BANG !
2kg
2ms-1
4kg
4ms-1
4kg
4ms-1
2kg
2ms-1
2kg
2.5ms-1
4kg
x = ? =
MOMENTUM BEFORE
MOMENTUM AFTER
By the Principle of Conservation of Momentum
2 x x (-4) = x (-2.5) x
= x
x = m s-1
Note that the 4 kg ball was moving to the left initially
John Parkinson

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