# Shared Flashcard Set

## Details

Vocab
Physics ch. 10-11
23
Physics
11/08/2007

Term
 work
Definition
 transfer of energy by mechanical means; constant force exerted on object in direction of motion times object's displacement
Term
 energy
Definition
 ability of object to produce change in itself or world around it
Term
 kinetic energy
Definition
 energy of object from its motion
Term
 work-energy theorem
Definition
 when work done on an object, change in kinetic energy occurs
Term
 joule
Definition
 unit of energy; 1 J of work when 1 N of force acts on object displaced 1 m
Term
 power
Definition
 work divided by time
Term
 watt
Definition
 unit of power; 1 J of energy transferred in 1 s
Term
 machine
Definition
 took making work easier by changing magnitude/direction of force exerted to do work
Term
 effort force
Definition
 force person exerts on machine
Term
 resistance force
Definition
 force exerted by machine
Term
Definition
 ratio of resistance force to effort force
Term
Definition
 displacement of effort force divided by displacement of load
Term
 efficiency
Definition
 ratio of output to input work
Term
 compound machine
Definition
 machine of 2 or more simple machine connected so resistance force of 1 machine becomes effort force of 2nd machine
Term
 rotational kinetic energy
Definition
 kinetic energy of object, proportional to object's moment of inertia and square of angular velocity
Term
 gravitational potential energy
Definition
 stored energy in system from gravitation force btwn. Earth and object
Term
 reference level
Definition
 position where gravitational potential energy is zero
Term
 elastic potential energy
Definition
 potential energy that may be stored in an object from change in shape
Term
 law of conservation of energy
Definition
 is a closed, isolated system, energy isn't created or destroyed but conserved
Term
 mechanical energy
Definition
 sum of kinetic and gravitational potential energy of a system
Term
 thermal energy
Definition
 measure of the internal motion of an object's particles
Term
 elastic collision
Definition
 kinetic energy before and after collision remains the same
Term
 inelastic collision
Definition
 kinetic energy after collision less than kinetic energy before
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