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14 Cards in this Set
- Front
- Back
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elastic collision
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a collision in which colliding objects rebound without lasting deformation or the generation of heat
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impulse
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the product of the force acting on an object and the time during which it acts
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impulse-momentum relationship
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Impulse is equal to the change in the momentum of the object that the impulse acts on. In symbol notation:
Ft=∆mν |
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inelastic collision
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a collision in which the colliding objects become distorted, generate heat, and possibly stick together
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law of conservation of momentum
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When no external net force acts on an object or a system of objects, no change of momentum takes place. Hence, the momentum before an event involving only internal forces is equal to the momentum after the event:
mv(before event) = mv(after event) |
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momentum
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the product of the mass of an object and its velocity
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conservation of energy
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Energy cannot be created or destroyed; it may be transformed from one form into another, but the total amount of energy never changes. In an ideal machine, where no energy is transformed into heat,
(work)input = (work)output and (Fd)input = (Fd)output |
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kinetic energy
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energy of motion, described by the relationship:
kinetic energy = ½mv² |
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machine
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a device for multiplying forces or simply changing the direction of forces
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potential energy
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the stored energy that a body possesses because of its position
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power
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the time rate of work:
power = work/time |
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watt
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the unit of power (1 joule per second)
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work
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the product of the force and the distance thought which the force moves:
W = Fd |
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work-energy theorem
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The work done on an object is equal to the enegy gained by the object:
Work = ∆E |
