# Shared Flashcard Set

## Details

Physics Definitions
N/A
43
Physics
10/31/2012

Term
 Motion
Definition
 The changing in position of an object relative to a reference point; an imaginary line joining the object to the reference point changes in length and direction or both.
Term
 Uniform Motion
Definition
 Movement in a straight line at a constant speed.
Term
 Average Speed
Definition
 Distance travelled in a specific time.
Term
 Velocity
Definition
 Speed and direction of an object.
Term
 Scalar Quantity
Definition
 Quantity that indicates magnitude only.
Term
 Vector Quantity
Definition
 Quantity that indicates magnitude and direction.
Term
 Distance Travelled
Definition
 Scaler quantity that measures how far an object has travelled.
Term
 Displacement
Definition
 Vector quantity that measures the change in direction and the change in direction or position of an object.
Term
 Acceleration
Definition
 Change in velocity during a specific time interval.
Term
 Force
Definition
 Push or pull applied to an object; measured in Newtons.
Term
 Work
Definition
 A measure of the amount of energy transferred from one object to another when an object moves against an opposing force or the speed of an object increases; calculated by multiplying the force acting on an object by the distance the object travels.
Term
 Energy
Definition
 Ability to do work.
Term
 Chemical Energy
Definition
 Potential energy stored in the chemical bonds of compounds.
Term
 Electrical Energy
Definition
 Work done by moving charges; energy produced by moving electrons.
Term
 Nuclear Energy
Definition
 Potential energy stored in the nucleus of an atom.
Term
 Kinetic Energy
Definition
 Energy of a moving object.
Term
 Gravitational Potential Energy
Definition
 Energy of an object because of its position above the surface of earth.
Term
 Mechanical Energy
Definition
 Energy due to the motion and position of an object.
Term
 Thermodynamics
Definition
 Study of the interrelationships between heat, work and energy.
Term
 Heat
Definition
 Energy transferred from an object at a higher temperature to one at a lower temperature; thermal energy.
Term
 Potential Energy
Definition
 Energy that is stored and held in readiness; energy that has the potential to do work; types of potential energy include gravitational, elastic, and chemical.
Term
 Elastic Potential Energy
Definition
 Energy stored in an object that has its shape changed by stretching, twisting or compressing.
Term
 Kinetic Energy
Definition
 Energy of a moving object.
Term
 Mechanical Energy
Definition
 Energy due to the motion and position of an object.
Term
 Thermal Power Stations
Definition
 Electrical generating station that uses thermal energy to produce steam to drive turbines; sources of thermal energy include coal, natural gas, and nuclear energy.
Term
 System
Definition
 A set of interconnected parts; a system can be classified as open, closed or isolated.
Term
 Open System
Definition
 A system that exchanges both matter and energy with its surroundings.
Term
 Closed System
Definition
 Any system that exchanges energy with its surrounding but does not exchange matter.
Term
 Isolated System
Definition
 System that cannot exchange either matter or energy with its surroundings.
Term
 First Law of Thermodynamics
Definition
 The total energy, including heat, in a system and its surroundings remain constant.
Term
 Perfect Machine
Definition
 Hypothetical machine in which all the input energy is converted completely into mechanical energy; also called perpetual motion machine.
Term
 Perpetual Motion Machine
Definition
 Hypothetical machine in which all the input energy is converted completely into mechanical energy; also called perfect machine.
Term
 Second Law of Thermodynamics
Definition
 Heat always flow naturally from a hot object to a cold object, never naturally from a cold object to a hot object.
Term
 Heat Engine
Definition
 Device that converts heat into mechanical energy.
Term
 Heat Pump
Definition
 Device that uses mechanical energy to transfer heat.
Term
 Internal Combustion Engine
Definition
 Device in which energy is released by burning fuel inside the engine.
Term
 Energy Input
Definition
 Energy used to do work.
Term
 Useful Energy Output
Definition
 Energy needed to do work.
Term
 Useful Work Output
Definition
 Work that a machine is supposed to do.
Term
 Renewable Energy Source
Definition
 Energy source that is continually and infinitely available.
Term
 Non-Renewable Energy Source
Definition
 Energy source that is limited and cannot be replaced.
Term
 Cogeneration
Definition
 Using waste energy from one process to power a second process.
Term
 Sustainable
Definition
 Description of any process that will not compromise the survival of living things or future generations while still providing for current energy needs.
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