# Shared Flashcard Set

## Details

Chapter 3 Exploring Motion and Forces
9th grade physics
13
Science
9th Grade
09/04/2012

## Cards Return to Set Details

Term
 SPEED
Definition
 The rate of motion, or the rate a which a body changes position. v=d/tSI unit k/h
Term
 INSTANTANEOUS SPEED
Definition
 The rate of motion at a given instant in time - radar gun from a police man!
Term
 CONSTANT SPEED
Definition
 Speed that does not change.A flat line on an acceleration graph.
Term
 AVERAGE SPEED
Definition
 A rate of motion determined by difiding the total distance traveled by the total travel time. (Mean)
Term
 VELOCITY
Definition
 The speed and direction of a moving body. 30 k/h north
Term
 ACCELERATION (3 types)
Definition
 The rate of change in velocity. (direction or speed)(+) speeding up(-) slowing down a change in direction
Term
 FORCE
Definition
 A push or a pull one body exerts on another body.
Term
 BALANCED FORCES
Definition
 Forces that are equal in size and OPPOSITE in direction. Balanced forces acting on a body do not change the motion of the body.
Term
 NET FORCE
Definition
 The sum (yep add) of the forces on an object when unbalanced forces are applied to it. A net force changes the object's speed, direction or BOTH.
Term
 INERTIA
Definition
 The tendency of an object to resist any change in its motion.
Term
 FRICTION (4 types)
Definition
 The force that opposes motion between two surfaces that are touching eachother.Rolling friction:balls, wheels...Sliding friction: flat surfacesFluid friction: air or water...Static Fricition: being still.
Term
 MASS
Definition
 The amount of matter in an object. Measured in grams (kilograms....)
Term
 NEWTON'S 1ST LAW OF MOTION (2 parts)
Definition
 An object moving at a constant velocity keeps moving at that velocity unless a net force acts on it.An object at rest stays at rest unless a net force acts on it.
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