# Shared Flashcard Set

## Details

Chapter 4: Newton's 1st Law
Newton's first law of motion-intertia
18
Physics
02/23/2009

Term
 2 Types of Motion by Aristotle
Definition
 natural motion and violent motion
Term
 Natural Motion
Definition
 Straight up or down. Objects seek natural resting places. "natural" for heavy things to fall & light things to rise. Such as a boulder falling, or smoke rising
Term
 Violent Motion
Definition
 imposed motion. result of forces that pushed or pulled. had external cause. objects in natural resting place could not move by themselves.  So, proper state of objects was 1 of rest unless pushed/pulled, or moving toward natural resting place
Term
 Copernicus
Definition
 reasoned that earth and planets orbit sun-wrote De Revolutionibus
Term
 Galileo
Definition
 demolished idea that force needed to keep object moving
Term
 Force
Definition
 any push or pull
Term
 Friction
Definition
 force that acts to resist relative motion -if absent, object would need no force to continue moving
Term
 Inertia
Definition
 the reluctance of any object to change its state of motion
Term
 Newton's 1st Law[law of inertia]
Definition
 Every object continues in a state of rest, or of motion in a straight line at constant speed, unless it is compelled to change that state by forces exerted upon it
Term
 Kilograms
Definition
 Mass is measured in
Term
 Mass
Definition
 the quantity of matter in an object. More specifically, mass is a measure of the inertia, or 'laziness,' that an object exhibits in response to any effort made to start it, stop it, or otherwise change ist state of motion
Term
 Weight
Definition
 the force of gravity on an object
Term
 Newton
Definition
 SI unit of force
Term
 Net force
Definition
 The combination of all forces acting on an object. it is this that changes on object's state of motion
Term
 Support Force[normal force]
Definition
 force that completely balances the weight of an object at rest
Term
 equilibrium
Definition
 a state of balance. the state of a body on which no net force acts
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