# Shared Flashcard Set

## Details

chapter 13
vocab
29
Physics
03/22/2012

Term
 work
Definition
 enegry to an object by the application of a force that causes the object to move in the direction of force
Term
 newtons times meateres
Definition
 (N.M) SI unit called joules (j)
Term
 power
Definition
 a quanitiy that measures the rate at which work is done or enegery is transformed
Term
 watts
Definition
 (W)
Term
 multiplying the force
Definition
 machines make force greater by decreasing the distance over which force is applied.
Term
Definition
 a quanity that expresses how much a machine multiplies force or distance
Term
 simple machines
Definition
 ne of the six basic types of machines which are the basis for all other forms of machines
Term
 simple machines famlies
Definition
 lever family and inclined plane family
Term
 lever classes
Definition
 first class levers, second class levers and third class levers
Term
 block and tackle
Definition
 multiple pullesy are sometimes combined into a single unit.
Term
 compound machine
Definition
 machine made of more than one simple machine
Term
 energy
Definition
 the capacity to do work
Term
 potential energy
Definition
 the energy that an object has because of the position, shape or condition of the object
Term
 gravitational potential energy
Definition
 2 or more objects seperated by vertical distance
Term
 mg
Definition
 weight of the object in newtons
Term
 kinetic energy
Definition
 the enrgy of an object due to the object's motion
Term
 Kenteic energy
Definition
 KE
Term
 mechanical energy
Definition
 the amount of work an object can do because of the object's kinetic energy abd potential energies
Term
 nonmechanical energy
Definition
 energy that lies at the level of the atom
Term
 nuclear fission
Definition
 to release nuclear energy
Term
 electric field
Definition
 location of charged particles
Term
 electromagnetic waves
Definition
 made up of electric and magnetic fields
Term
 law of conservation of energy
Definition
 energy cannot be created or destroyed
Term
 first law of thermodynamics
Definition
 no ernergy is transferred as heat or as work. mechanical energy is not conserved
Term
 open system
Definition
 energy and matter is exchanged with the surroundings
Term
 closed system
Definition
 energy is exchanged
Term
 isolated system
Definition
 energy nor matter is exchanged
Term
 efficiency
Definition
 a quanitity usually expressed as a percentage that measures the ratio of useful work output to work input
Term
 perpetual motion machine
Definition
 a machine desgined to keep going forevr witho any input of energy
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