AP Physics chapter 7
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12 Terms
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momentum
the product of mass and velocity
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impulse
the product of the average force and the time during which the force acts
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impulse-momentum theorem
when a net average force acts on an object during a time interval, the impulse of this is equal to the change in momentum of the object
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internal forces
gravity forces, magnetic force, electrical force, and spring force
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closed system
a system that has constant mass
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isolated system
a system where the external Fnet=0
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elastic collisions
one in which the total kinetic energy of the system after the collision is equal to the total kinetic energy before the collision
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inelastic collisions
one in which the total kinetic energy of the system is not the same before and after the collision; if the objects stick together after colliding, the collision is said to be completely inelastic
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the law of conservation of momentum
the total momentum of a system initially is equal to the total momentum of a system finally, therefore energy is conserved
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What is the most important factor when determining the force an object experiences during an interaction?
the time
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Two objects collide. Which of the following quantities must have equal magnitudes?
the forces on each object, the impulses of each object, the change in momentum of each object
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Two objects collide and stay together. Which of the following must be true?
the collision is inelastic, the collision conserves momentum, at least one object slows down
Note 
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