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6.1 Mometum and Impulse

6.1 Mometum and Impulse. pp. 208 - 214 Mr. Richter. Agenda. Warm-Up Collect Science Fair Notebooks. Introduction to Momentum Notes: Momentum Impulse Stopping Distance and Momentum Force, Time and Impulse. Objectives: We Will Be Able To….

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6.1 Mometum and Impulse

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  1. 6.1 Mometum and Impulse pp. 208 - 214 Mr. Richter

  2. Agenda • Warm-Up • Collect Science Fair Notebooks. • Introduction to Momentum • Notes: • Momentum • Impulse • Stopping Distance and Momentum • Force, Time and Impulse

  3. Objectives: We Will Be Able To… • Compare the momentum of different moving objects. • Compare the momentum of the same object moving with different velocities. • Identify examples of change in the momentum of an object. • Describe changes in momentum in terms of force and time.

  4. Warm-Up: • If you are asked to stop a rolling boulder, what are two things you would want to know about the boulder? • Discuss at your table.

  5. Momentum

  6. Momentum • What does the word momentum mean in everyday life? • In physics, it means something similar. • Momentum is a measure of how difficult an object would be to stop. • Momentum depends on the mass of the object and its velocity.

  7. Momentum • Which has more momentum, a bowling ball or a golf ball? • Actually, it depends which has more speed. • Can you think of a small object that typically has a lot of momentum? • What about a big object that has very little momentum?

  8. Calculate Momentum • A 2250 kg pickup truck has a velocity of 25 m/s to the east. What is the momentum of the truck? • p = 56000 kg*m/s

  9. Change in Momentum

  10. Change in Momentum • To cause a change in momentum, a force needs to be applied over a period of time. • A change in momentum is also called impulse.

  11. Change in Momentum Calculations • A 1400 kg car moving westward with a velocity of 14 m/s collides with a utility pole and is brought to rest in 0.30 s. Find the magnitude of the force exerted on the car during the collision. • F = 70000 N to the east

  12. Change in Momentum • A small amount of force will require a larger amount of time to change momentum. • Tapping on the brakes. • Using airbag. • A large force must be used if the momentum will be changed quickly. • Slamming on the brakes. • No airbag. • A force applied for a longer amount of time will cause a greater change in momentum. • Following through, like in sports.

  13. Momentum and Stopping Distance • The more momentum an object has, the harder it is to stop. • This means that objects with more momentum will take longer times and distances to stop. • Using the one-dimensional motion equations from Chapter 2 (p. 58), we can calculate these distances.

  14. Momentum and Stopping Distances • A 2250 kg car traveling to the west slows down uniformly from 20.0 m/s to 5.00 m/s. How long does it take the car to decelerate if the force on the car is 8450 N to the east? How far does the car travel during the deceleration? • Δt= 4.00 s • Δx= -50.0 m (50 m to the west)

  15. Wrap-Up: Did we meet our objectives? • Compare the momentum of different moving objects. • Compare the momentum of the same object moving with different velocities. • Identify examples of change in the momentum of an object. • Describe changes in momentum in terms of force and time.

  16. Homework • p. 209 #1-3 Due Monday • Due Tuesday • p. 211 #1, 3 • p. 213 #2

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