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Section 1: Momentum and Impulse
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Just a few Q’s What is your understanding of momentum?
What factors cause an object to have momentum? If an object has momentum, what does that tell you about it?
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Notes: Momentum: Momentum is like inertia in motion.
Momentum = Mass x Velocity Or p = mv Problem: A .2kg baseball approaches the plate with a velocity 20m/s. Find its momentum.
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What is impact???
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Balloon Toss Demo: Get a partner and fill one balloon. Referrals to those who throw them at each other.
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Impulse: Change in momentum
Derivation: When objects are stopped slowly….. When objects are stopped quickly….. (Demo: Desk Jump)
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Sample Problem 1: Impulse b) Force to stop in .009s
Find the following for a .5kg baseball when colliding with a wall and coming to a stop from 10m/s. Impulse b) Force to stop in .009s
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Sample Problem 2: Find the following for the .5kg ball:
a) Change in momentum b) Impulse c) Force to stop in .009s
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Describe how to increase the impulse? (wood breaking demo)
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Reduce the impact force, so don’t forget to wear your helmet!
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Compression of a golf ball
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Turbines
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Warm-up: Find the Impulse for Each Situation
Warm-up: Find the Impulse for Each Situation. The mass of the car is 1000kg
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Impulse Demos: Egg toss Chair Jump Balloon Toss
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Find the total momentum before and after the collision
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Egg Launch Lab Objective: Wrap three eggs in a container so that when launched against a wall, they will not break. Grading: No eggs break- 20/20 1 egg breaks – 17/20 2 eggs break – 14/20 3 eggs break – 10 /20
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