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Published byCornelia Moore Modified over 8 years ago
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UT Homework is due Thursday the 26 th !!
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Defined as the product of a body’s mass and its velocity. Vector quantity that points in the direction of the velocity. SI unit is the kgm/s A fast moving car will have more momentum than a slower car with the same mass.
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This means that we exert force to Change an object’s momentum. (Duh!)
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In an isolated system of bodies, the momentum remains constant. Generally, momentum is NOT conserved: In the presence of friction (object loses KE because it gains thermal energy) When the object is working against gravity (object loses KE because it gains PE)
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Recall : This means that a force applied over time results in a change in momentum. This is called Impulse! (J)
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Impulse (J) = area under the curve ∆p = Impulse (J) = area under the curve Area 1:.5x.02secx60N=.6kgxm/s Area 2:.02secx60N= 1.2kgxm/s Area 3:.5x.02secx60N=.6kgxm/s Total Impulse = 2.4kgxm/s
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Elastic: momentum and kinetic energy are conserved The only true elastic collisions are atomic particles and subatomic particles We use billiard balls to model elastic collisions because they lose very little KE. Inelastic: momentum is conserved but KE is lost due to deformations, sound, etc. Most collisions fall into this category If I lose ANY KE (due to friction, sound energy, etc)
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Perfectly Inelastic: momentum is conserved but KE is lost due to deformations, sound, etc, AND the objects stick together after collision! Example: cars that collide and stick together
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The point about which a body moves as if all forces were exerted there. The point has an x and y component. SI unit is the meter (m)
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Center of raft is (6m, 6m)
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