# Shared Flashcard Set

## Details

Chapter 2
Chapter 2 vocab and definitions
16
Science
01/31/2011

Term
 force
Definition
 a push or a pull
Term
 net force
Definition
 the combination of all forces acting on an object
Term
 balanced forces
Definition
 the effects of two different forces cancel each other; the net force is zero; velocity is not changed
Term
 unbalanced forces
Definition
 the net force is not zero; the effects of the forces don't cancel; velocity of object changes
Term
 Newton's First Law of Motion
Definition
 if the net force acting on an object is zero, the object remains at rest; if the object is already moving, it will continue to move in a straight line with a constant speed
Term
 friction
Definition
 the force that brings nearly everything to a stop; the force one object exerts on another when they rub against each other
Term
 Newton's Second Law of Motion
Definition
 the acceleration of an object equals the net force divided by the mass and it's in the direction of the net force
Term
 weight
Definition
 the size of the gravitational force exerted on an object
Term
 center of mass
Definition
 the point in an object that moves as if all the object's mass were concentrated at that point
Term
 Newton's Third Law of Motion
Definition
 forces always act in equal but opposite pairs (for every action there is an equal but opposite reaction)
Term
 inertia
Definition
 the tendency of an object to resist change in its motion
Term
 sliding friction
Definition
 when static friction acts on an object at rest (surfaces tend to stick together; the box stops moving when you stop pushing)
Term
 static friction
Definition
 the type of friction that prevents an object from moving (box)
Term
 rolling friction
Definition
 occurs when an object rolls across a surface (bike tire and ground)
Term
 mass
Definition
 amount of matter in an object
Term
 accelerate
Definition
 an object will do this when the net force is not zero
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