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science360/obj/video/d0e16d27-05d4-4511-9394-2758aa066981

Momentum. http://science360.gov/obj/video/d0e16d27-05d4-4511-9394-2758aa066981. Momentum -“mass in motion” Mass = How much of something there is. Motion = any movement or change in position or time. Variables.

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science360/obj/video/d0e16d27-05d4-4511-9394-2758aa066981

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  1. Momentum http://science360.gov/obj/video/d0e16d27-05d4-4511-9394-2758aa066981

  2. Momentum -“mass in motion” • Mass = How much of something there is. • Motion = any movement or change in position or time.

  3. Variables • Momentum depends on: how much stuff is moving (mass) and how fast the stuff is moving (velocity). • What else depends on mass and velocity?

  4. Formula • P=M*V • In physics, the symbol for momentum is p. • M is mass (in kg) • V is velocity in (m/s) • Unit of momentum (p) = kg * m/s

  5. Is Momentum Vector or Scalar? vector

  6. Check For Understanding 1. Determine the momentum of a ... • 60-kg halfback moving eastward at 9 m/s. 60 * 9 = 540 kg * m/s b. 1000-kg car moving northward at 20 m/s. 1000 * 20 = 20,000 kg * m/s c. 40-kg freshman moving southward at 2 m/s. 40 * 2 = 80 kg * m/s

  7. What does the equation mean? • Momentum is DIRECTLY PROPORTIONAL to both mass and velocity.

  8. Check For Understanding 1. A car possesses 20,000 units of momentum. What would be the car's new momentum if ... • a. its velocity was doubled. • b. its velocity was tripled. • c. its mass was doubled (by adding more passengers and a greater load) • both its velocity was doubled and its mass was doubled.

  9. Check For Understanding 1. A car possesses 20,000 units of momentum. What would be the car's new momentum if ... • a. its velocity was doubled. 40,000 • b. its velocity was tripled. 60,000 • c. its mass was doubled (by adding more passengers and a greater load) 40,000 • both its velocity was doubled and its mass was doubled. 80,000 (quadruple)

  10. Momentum of stationary object = 0 • KE of stationary object = ?

  11. Exit Ticket • What is the equation for momentum? p = ______________ • What units are used to measure momentum? ____________________ • Which has more momentum, a ping-pong ball or a bowling ball? Assume both are moving with the same velocity. EXPLAIN YOUR ANSWER! • Which has more momentum, a car going 5 mph or a car speeding down the highway at 65 mph? EXPLAIN YOUR ANSWER! • A person with a mass of 50 kg is moving at 4 m/s. How much momentum does the person have? Find: Solution: Given: 6. His teammate has a mass of 40 kg is moving at 5 m/s. Who has more momentum? Why?

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