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# Chapter 2

TermDefinition
Contact Force A push or pull on an object that is touching it.
Force A push or pull on an object.
Friction Force that resists the motion of two surfaces that are touching.
Gravity Attractive force that exists between all objects that have mass.
Mass Amount of matter in an object.
Noncontact Force A force one object can apply to another object without touching it.
Weight Gravitational force exerted on an object.
Balanced Forces Combined forces form a net force of zero.
Inertia Tendency of an object to resist a change in motion.
Net Force Combination of all the forces acting on an object.
Newton's First Law of Motion The motion of an object does not change if the net force on an object is zero.
Reference Direction Given direction from the starting point to describe an object's position.
Unbalanced Forces Combined forces that form a net force that is not zero.
Newton's Second Law of Motion Acceleration is equal to the net force exerted on the object divided by the object's mass.
Force Pair Forces that two objects apply to each other.
Law of Conservation of Momentum Total momentum of a group of objects remain the same unless outside forces act on the objects.
Momentum Measure of how hard it is to stop a moving object.
Newton's Third Law of Motion For every action there is an equal and oposite reaction.
Created by: gstubblefield