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Momentum

Momentum. February 14, 2013. Momentum. All objects have mass; so if an object is moving, then it has momentum - it has its mass in motion. The amount of momentum which an object has is dependent upon two variables: how much matter is moving? how fast the matter is moving?.

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Momentum

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  1. Momentum February 14, 2013

  2. Momentum • All objects have mass; so if an object is moving, then it has momentum - it has its mass in motion. • The amount of momentum which an object has is dependent upon two variables: • how much matter is moving? • how fast the matter is moving?

  3. Momentum: "mass in motion” • Equation: p = m x v • Unit: kg*m/s

  4. Momentum • Momentum is a vector quantity.

  5. Momentum Consider a Mack truck and a roller skate moving down the street at the same speed. The considerably greater mass of the Mack truck gives it a considerably greater momentum. If the Mack truck were at rest, which would have the greater momentum? If an object is at rest, the momentum of that object is “0” because there is nomass in motion.

  6. Momentum Questions 1. Determine the momentum of a ... a.) 60 kg halfback moving eastward at 9 m/s. b.) 1000 kg car moving northward at 20 m/s. c.) 40 kg man moving southward at 2 m/s. p = 540 kg*m/s, east p = 20,000 kg*m/s, north p = 80 kg*m/s, south

  7. Momentum Questions 2. A car possesses 20,000 units of momentum. What would be the car's new momentum if ... a.) its velocity were doubled b.) its mass were doubled c.) both its velocity and mass were doubled p = 40,000 units p = 40,000 units p = 80,000 units

  8. Conservation of Momentum

  9. Law of Conservation of Momentum The momentum of a system remains the same unless acted upon by an external force. Hey! It’s the Law!

  10. Can you think of any examples where you think momentum is conserved? Newton Balls Shooting Pool Firecracker

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