# Shared Flashcard Set

## Details

Force and Motion
Force and Motion Test Review
18
Physics
01/06/2008

Term
 When is an object in motion
Definition
 When it's position is changing relative to a reference point
Term
 Speed =
Definition
 Distance/Time
Term
 Gravity
Definition
 A force that pulls objects together
Term
 2 Parts of FORCE
Definition
 Mass and Acceleration
Term
 What causes a change in an object's motion?
Definition
 An unbalanced force acting on the object.
Term
 What causes a thrown object to change its motion?
Definition
 The force of gravity that pull the object towards the earth.
Term
 Newton's 1st Law of Motion
Definition
 An object at rest remains at rest and an object in motion remains in motion until an unbalanced force acts on it.
Term
 Newton's 2nd Law of Motion
Definition
 The force of an object is equal to its mass times accelerationF = MA
Term
 Newton's 3rd Law of Motion
Definition
 Forces act in pairs, equal in size, but opposite in directions.
Term
 Potential energy
Definition
 Stored energyExamples: battery, top of hill/roller coaster
Term
 Kinetic energy
Definition
 The energy of motionExamples: rolling down the hill/roller coaster, throwing a ball
Term
 What happens to an object's mass when it goes to the moon?  Why?
Definition
 Nothing, the object is made of same amount of matter
Term
 What happens to an object's weight when it goes to the moon?  Why?
Definition
 The object weighs less than on earth.  Because the moon is smaller and has a smaller force of gravity.
Term
 What is the name of a force that causes an object’s motion to slow down because of the rubbing of 2 surfaces?
Definition
 Friction
Term
 What is acceleration?  What changes when something is accelerating?
Definition
 A change in velocity.  The speed or direction of an object is changing.
Term
 What is work?  What must happen for work to be done?
Definition
 Work happens when a force causes an object to move.  The object must move for work to happen.
Term
 Why does an object's weight change when it goes to the moon?
Definition
 The moon has a much smaller mass than the earth, so it has a smaller force of gravity.  Weight is a measure of gravity, less gravity means it weighs less.
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