# Shared Flashcard Set

## Details

OCR Physics G481 Heinemann
Definitions for AS Physics
23
Physics
04/09/2013

Term
 Scalar Quantity
Definition
 One that has magnitude (size) but not direction
Term
 Vector Quantity
Definition
 One that has magnitude (size and direction
Term
 Speed
Definition
 Distance per unit time
Term
 Displacement
Definition
 Distance moved in a stated direcition
Term
 Speed
Definition
 Distance travelled per unit time - Scalar
Term
 Velocity
Definition
 Displacement per unit time - Vector
Term
 Instantanious Speed
Definition
 The speed at a given instant of time - it is the gradient of the graph of displacement against time at that instant
Term
 Acceleration
Definition
 The rate of change of velocity
Term
 One Newton
Definition
 The force that causes a mass of one kg to have an acceleration of one metre per second, every second
Term
 Weight
Definition
 The gravitational force on a body
Term
 Couple
Definition
 A pair of equal and parallel but opposite forces, which tends to produce rotation only
Term
 The Moment of a Force
Definition
 The force multiplied by the perpendicular distance from a stated point
Term
 Density
Definition
 Defined as mass per unit volume
Term
 Pressure
Definition
 Force per unit area
Term
 One Joule
Definition
 The work done when a force of 1 Newton moves its point of application 1 metre in the direction of the force
Term
 Energy
Definition
 The stored ability to do work
Term
 Conservation of Energy
Definition
 Describes the situation in any closed system where energy can be converted from one form to another but cannot be created or destroyed
Term
 Gravitational Potential Energy
Definition
 The energy stored in an object (the work that an object can do) by virtue of its position in a gravitational field
Term
 Kinetic Energy
Definition
 The work an object can do by virtue of its speed
Term
 Power
Definition
 The rate of doing work
Term
 One Watt
Definition
 1 Joule per second
Term
 Stress
Definition
 Force per unit cross sectional area
Term
 Strain
Definition
 Extension per unit length
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