# Shared Flashcard Set

## Details

Chapter 5Matter in Motion
Physical Science
17
Science
12/08/2011

Term
 Motion
Definition
 an object's change in position over time when compared with a reference point
Term
 Reference Point
Definition
 an object that appears to stay in place in relation to an object being observed for motion
Term
 Speed
Definition
 the rate at which an object moves; speed depends on the distance traveled and the time taken to travel that distance
Term
 Velocity
Definition
 the speed of an object in a particular direction
Term
 Acceleration
Definition
 the rate at which velocity changes; an object accelerates if its speed changes, if its direction changes, or if both its speed and direction change
Term
 Deceleration
Definition
 acceleration in which velocity decreases
Term
 Force
Definition
 a push or pull; all forces have both size and direction
Term
 Newton (N)
Definition
 the SI unit of force
Term
 Net Force
Definition
 the force that results from combining all the forces exerted on an object
Term
 Friction
Definition
 a force that opposes motion between two forces that are touching
Term
 Energy
Definition
 the ability to do work
Term
 Potential Energy
Definition
 the energy of position or shape
Term
 Kinetic Energy
Definition
 the energy of motion; kinetic energy depends on speed and mass
Term
 The Law of Conservation of Energy
Definition
 the law states that energy is neither created nor destroyed
Term
 Gravity
Definition
 a force of attraction between objects that is due to their masses
Term
 Weight
Definition
 a measure of gravitational force that is exerted on an object, usually by the earth
Term
 Mass
Definition
 the amount of matter that something is made of
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