# Shared Flashcard Set

## Details

8th Grade Physics Chap. 2
Physics Notes
31
Physics
8th Grade
02/20/2012

## Cards Return to Set Details

Term
 MOTION
Definition
 THE STATE IN WHICH ONE'S OBJECTS DISTANCE FROM ANOTHER IS CHANGING.
Term
 DISTANCE
Definition
 THE TOTAL LENGTH OF THE ACTUAL PATH BETWEEN TWO POINTS.
Term
 DISPLACEMENT
Definition
 THE LENGTH AND DIRECTION OF A STRAIGHT LINE BETWEEN STARTING AND ENDING POINTS.
Term
 SPEED
Definition
 SPEED = DISTANCE / TIME
Term
 VELOCITY
Definition
 SPEED AT A GIVEN DIRECTION
Term
 ACCELERATION
Definition
 THE RATE AT WHICH VELOCITY CHANGES WITH TIME.
Term
 ACCELERATION REFERS TO
Definition
 1. INCREASING SPEED2. DECREASING SPEED3. CHANGING DIRECTION
Term
 ACCELERATION FORMULA
Definition
 ACCELERATION = FINAL VELOCITY - INITIAL VELOCITY / TIME
Term
 LAW OF CONSERVATION OF ENERGY
Definition
 ENERGY CANNOT BE CREATED OR DESTROYED.
Term
 FORCE
Definition
 A PUSH OR PULL EXERTED ON AN OBJECT.
Term
 SI UNIT FOR FORCE
Definition
 (N) NEWTONS
Term
 BALANCED FORCES
Definition
 FORCES THAT ACT ON AN OBJECT AND DOES NOT CHANGE THE OBJECT'S VELOCITY.
Term
 UNBALANCED FORCES
Definition
 NET FORCE IS INCREASED ON A SIDE AND CHANGES THE OBJECT'S VELOCITY.
Term
 FRICTION
Definition
 THE FORCE THAT ONE SURFACE EXERTS ON ANOTHER WHEN THE TWO SURFACES RUB AGAINST EACH OTHER.
Term
 STATIC FRICTION
Definition
 ACTS ON OBJECTS NOT MOVING. (PUSHING A HEAVY DESK ACROSS A FLOOR)
Term
 SLIDING FRICTION
Definition
 WHEN TWO SOLID SURFACES SLIDE OVER EACH OTHER.
Term
 ROLLING FRICTION
Definition
 WHEN AN OBJECT ROLLS ACROSS A SURFACE.
Term
 FLUID FRICTION
Definition
 WHEN A SOLID OBJECT MOVES THROUGH A FLUID (WATER, AIR, ETC...)
Term
 GRAVITY
Definition
 FORCE THAT PULLS OBJECTS TOWARDS EACH OTHER.
Term
 MASS AND DISTANCES EFFECT ON GRAVITY
Definition
 THE FORCE OF GRAVITY INCREASES WITH GREATER MASS AND DECREASES WITH GREATER DISTANCE.
Term
 WEIGHT
Definition
 GRAVITATIONAL FORCE EXERTED ON A PERSON OR OBJECT AT THE SURFACE OF PLANETS.
Term
 GRAVITATIONAL FORCE
Definition
 WEIGHT = MASS X ACCELERATION DUE TO GRAVITY
Term
 FREE FALL
Definition
 INSTANCE WHEN THE ONLY FORCE ACTING ON AN OBJECT IS GRAVITY. THE OBJECT IS SAID TO BE IN A FREE FALL. IT IS ACCELERATING. THE FORCE OF GRAVITY ALONE CAUSES OBJECT TO INTO A DOWNWARD DIRECTION.
Term
 AIR RESISTANCE (AR/DRAG)
Definition
 A TYPE OF FLUID FRICTION THAT ACTS ON OBJECTS FALLING THROUGH AIR. GREATER MASS = GREATER AIR RESISTANCE.
Term
 INERTIA
Definition
 THE TENDENCY OF AN OBJECT TO RESIST A CHANGE IN MOTION.
Term
 NEWTON'S FIRST LAW OF MOTION
Definition
 AN OBJECT WILL REMAIN AT REST OR IN MOTION AT A CONSTANT VELOCITY UNLESS ITS IS ACTED UPON BY AN UNBALANCED FORCE. AN UNBALANCED FORCE WILL CAUSE AN OBJECT TO SPEED UP, SLOW DOWN, OR CHANGE DIRECTION.
Term
 NEWTON'S SECOND LAW OF MOTION
Definition
 IF ONE OBJECT EXERTS FORCE ON ANOTHER OBJECT, THEN THE SECOND OBJECT EXERTS FORCE OF EQUAL STRENGTH IN THE OPPOSITE DIRECTION ON THE FIRST OBJECT.
Term
 NEWTON'S THIRD LAW OF MOTION
Definition
 ONE OBJECT EXERTS FORCE ON ANOTHER OBJECT, THE THE SECOND OBJECT EXERTS FORCE OF EQUAL STRENGTH IN THE OPPOSITE DIRECTION OF THE FIRST. FOR EVERY ACTION THERE IS AN EQUAL BUT OPPOSITE REACTION.
Term
 CENTRIPETAL FORCE
Definition
 A FORCE THAT CAUSES AN OBJECT TO MOVE IN CIRCLE.
Term
 DENISTY
Definition
 THE RATIO OF THE MASS OF A SUBSTANCE TO ITS VOLUME.
Term
 SPEED
Definition
 THE LINE ON A DISTANCE AND TIME GRAPH REPRESENTS.
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