01_momimp - Lesson 1: Momentum & Impulse How does a...

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How does a karate expert chop through cement blocks with a bare hand? Why does a fall onto a trampoline hurt less than onto a cement floor? Why do people in larger vehicles usually end up with fewer injuries in accidents? It’s easy to come up with answers like… “The karate guy is strong!” “Trampolines are softer!” “Bigger is better!” ...but have you ever stopped to consider the why? That’s when physics comes walking in, waving explanations in everyone’s face. Spend a couple minutes right now to come up with explanations of the three situations using physics principles you have learned so far. Keep these situations and your explanations in mind as you cover this section on momentum and impulse. See if you need to modify or change your explanations based on what you learn. Momentum Momentum is an idea that combines mass and velocity into one package. It is an idea that is similar to inertia and kinetic energy . Inertia is the property of an object to stay at rest or in motion. Kinetic energy is the amount of energy that an object has due to its motion. (E k = ½ mv 2 ) Momentum is not truly either of these, but ends up like a mix of the two. If you compare and contrast momentum and kinetic energy , you’ll notice a couple things… First, they both have mass and velocity in their formulas. Second, kinetic energy has to do with ability to do work, momentum doesn’t. Although they are similar, they are not the same. We haven’t given you any way to calculate inertia yet, so is momentum the same as inertia? Not really. Inertia is a concept, not something that is directly measured. Momentum is calculated by multiplying the mass and velocity of an object. p = m v p = momentum (kg m/s) m = mass (kg) v = velocity (m/s) Notice that momentum does not have a nice derived unit, although I would appreciate it if you lobbied physicists to name it the “Clintberg” in my honor. You’ll just need to use the units “kg
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This note was uploaded on 12/02/2011 for the course PHYSICS 235 taught by Professor Staff during the Fall '08 term at Rutgers.

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01_momimp - Lesson 1: Momentum & Impulse How does a...

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