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Momentum and Impulse (Aka – smackin ’ the heck out of stuff for fun and profit)

Momentum and Impulse (Aka – smackin ’ the heck out of stuff for fun and profit). P = mv J = Ft Momentum is vector, and is conserved. Warmup 12/4 & 12/5. If you drop an egg onto concrete, will it break? Why or why not?

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Momentum and Impulse (Aka – smackin ’ the heck out of stuff for fun and profit)

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  1. Momentum and Impulse (Aka – smackin’ the heck out of stuff for fun and profit) P = mv J = FtMomentum is vector, and is conserved

  2. Warmup 12/4 & 12/5 • If you drop an egg onto concrete, will it break? Why or why not? • If you drop an egg onto a super soft, super fluffy, giant mattress, will it break? Why or why not?

  3. Physics Magic • Raise your hand if you believe that Mr. Schalit is a physics wizard who can have any student in the school, even a pitcher for the baseball team, throw an an egg at a target as hard as possible, and that the egg won’t break.

  4. Oh, ye of little faith… • Turns out, it’s actually pretty easy, once you understand how momentum and impulse work. And we’re going to go over the math shortly, but first, it’s time to see that math in action. So it’s time for a lab.

  5. Shaken, Not Scrambled: Egg LabCounts as a take-home exam, due next block (it’s an eggzam) • Students will form up into groups of three or more. Each group will get 2 stopwatches, and 1 egg. • Each group will take turns; one partner will throw the egg while the other two members time A) the amount of time from when the person throws the egg to when it hits the target B) the amount of time from when the egg hits the target until when it stops moving.

  6. Egg Lab: Calculations75 points • Solve for the average velocity of your egg. • The formula for momentum is P = mv. The mass of your egg is 60 g. Solve for the average momentum of your egg. (remember the correct units for mass!!!) • By the time your egg came to rest, what was its momentum? • Impulse is the change in momentum ( ∆P ). What impulse was applied to the egg? • The formula for impulse is J = Ft. Solve for the force of your collision.

  7. Egg Lab Conclusion Questions25 points • Airbags, padded dashboards, padded steering wheels: all of those things are designed to make getting into a car crash safer. Using the equation for impulse, explain why these materials work. • If momentum is conserved, and momentum is a vector quantity, if I shoot a bullet with a momentum of 35.5 kg m/s, how much will the recoil be for my rifle? • Bob has an old M1 Garand from WWII, but the recoil is too strong. He replaces the wooden furniture on the gun with solid steel. The gun is much heavier now. Will Bob feel as much recoil as before, more recoil than before, or less recoil than before? Why?

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