Section 1: Momentum and Impulse

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Presentation transcript:

Section 1: Momentum and Impulse

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?

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.

What is impact???

Balloon Toss Demo: Get a partner and fill one balloon. Referrals to those who throw them at each other. 

Impulse: Change in momentum Derivation: When objects are stopped slowly….. When objects are stopped quickly….. (Demo: Desk Jump)

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

Sample Problem 2: Find the following for the .5kg ball: a) Change in momentum b) Impulse c) Force to stop in .009s

How can I increase the impulse? http://www.youtube.com/watch?v=vQSVHL4Qwe0&list=PLBFB035EB9BF46764

Reduce the impact force! Don’t forget to wear your helmet!

Compression of a golf ball

Turbines

Example: Find the Impulse for Each Situation Example: Find the Impulse for Each Situation. The mass of the car is 1000kg

Collisions MOMENTUM IS ALWAYS CONSERVED Elastic Collisions: Momentum & Kinetic Energy are conserved; things don’t stick together. Inelastic Collisions: Momentum is conserved, but Kinetic Energy is not.

Find the total momentum & EK before and after the collision Find the total momentum & EK before and after the collision. What type of collision is this?

Please abide by the following rules so that it Egg Drop Project Due 12/13/13 Objective: Pack a single, fresh, hen’s egg so well that when it is dropped from the 300 building 2nd story landing (~15 ft), it will not break AND will land in the target. Please abide by the following rules so that it is fun for all. Fresh eggs only (will be provided on 12/13) No parachutes Maximum dimensions 6” x 6” x 6” You may use a suspension medium (packing peanuts, bubble wrap, jello, etc.), but you must be able to get the egg inside on due date.

Egg Drop Project Due 12/13/13 Grading: 3 drops maximum (45 pts) 15 pts: lands within 0.5 m of target center. 10 pts: lands within 1.0 m of target center. 5 pts: lans within 2.0 m of target center