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HARD TO STOP

Why can’t it stop easily ??. HARD TO STOP. 2. It is FAST. 1. It is MASSIVE. IT has a lot of MOMENTUM. MOMENTUM. MOMENTUM. =. MASS. VELOCITY. X. p = m v. UNITS of MOMENTUM. Mass x velocity = kg x m s -1 = kg ms -1. m = 150 000 tonnes. v = 25 knots = 12.5 m s -1. p = ?.

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HARD TO STOP

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

  2. MOMENTUM

  3. MOMENTUM = MASS VELOCITY X p = m v

  4. UNITS of MOMENTUM Mass x velocity = kg x m s-1= kg ms-1

  5. m = 150 000 tonnes v = 25 knots = 12.5 m s-1 p = ? 150 000 000 kg x 12.5 ms-1 = 1875000 000 kg ms-1 QM2 = 1.875 x 109 Kgm/s m = 650 kg v = 200 mph = 89 m s-1 p = ? 650 kg x 89 ms-1= 57 850 kg ms-1 Ferrari F1 = 5.785 x 104 Kgm/s

  6. THE PRINCIPLE OF CONSERVATION OF MOMENTUM Thetotal MOMENTUM of a system is CONSERVED, providing no external forces are acting on it.

  7. VECTORS H A V E MAGNITUDE A N D D I R E C T I O N jp@stbrn

  8. BANG ! 2kg 2kg 4kg 4kg 4ms-1 4ms-1 2ms-1 2ms-1 2kg 4kg 2.5ms-1 x = ? = MOMENTUM BEFORE MOMENTUM AFTER By the Principle of Conservation of Momentum 2 x 2 + 4 x (-4) = 2 x (-2.5) + 4 x 4 - 16 = -5 + 4 x x = - 1.75 m s-1 Note that the 4 kg ball was moving to the left initially

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