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Momentum Momentum is the amount of ‘oomph’ a moving object has.

Momentum Momentum is the amount of ‘oomph’ a moving object has. “The more ‘oomph’ the object has, the harder it is to stop” p = mv (vector quantity) p = momentum (measured in ________) m = mass (in kg) v = velocity (in ms -1 ). Question Why do we need to wear seat belts?. Example ONE

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Momentum Momentum is the amount of ‘oomph’ a moving object has.

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  1. Momentum Momentum is the amount of ‘oomph’ a moving object has. “The more ‘oomph’ the object has, the harder it is to stop” p = mv(vector quantity) p = momentum (measured in ________) m = mass (in kg) v = velocity (in ms-1)

  2. Question Why do we need to wear seat belts?

  3. Example ONE A cricket ball of mass 500 g is bowled straight into the batter’s face at a speed of 35 ms-1. The batter blocks the ball with his bat, then the ball flies directly back towards the bowler’s face at 25 ms-1. Calculate the ball’s initial momentum Calculate the ball’s final momentum Calculate the ball’s change in momentum

  4. Example TWO A 120 kg man accidently falls off the roof of a building. The man’s velocity, the moment before he hits the ground, is 40 ms-1. He comes to a complete stop after he has hit the ground. Calculate his change in momentum.

  5. Question Do you think the man survived the fall?

  6. Impulse = “change in momentum” • Δp = pf – pi • = mvf – mvi • = m (vf – vi) • = m Δv • = m a Δt • = F Δt F = ma • Δv • a = • Δt

  7. Impulse = “change in momentum” • Δp = F Δt • “Change in momentum • is a result of force”

  8. Question Do you think the man survived the fall?

  9. Question How do air bags work?

  10. Example THREE • A driver tries to slow down a runaway car by pushing against its motion. The car’s mass is 2100 kg and its initial velocity is 3.0 ms-1. • Will the driver manage to stop the car if: • the resultant force on the car is 600 N (against the car’s motion) and; • the force is applied for 9.0 seconds?

  11. Activity 10A (green book, pg. 123) Questions 1, 2, 3 and 6 only

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