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# iScience Vocabulary

### Chapter 2 The Laws Of Motion

TermDefinition
Force A push or pull on an object.
Contact Force Is a push or a pull on one object by another that is touching it.
Noncontact Force A force that one object can apply to another object without touching it.
Gravity Is an attractive force that exist between all the objects that have mass.
Mass Is the amount of matter in an object.
Weight Is gravitational force exerted on an object.
Friction Is a force that resist the motion of two surface that are touching.
Net Force The combination of all the force acting on an object.
Balanced Force Forces acting on an object that combine and form a net force of zero.
Unbalanced Force Force acting on an object that combine and form a net force that is not zero.
Newtons's First Law of Motion If the net force on an object is zero.
Inertia The tendency of an object to resist a change in its motion.
Newton's Second Law of Motion The acceleration of an object is equal to the net force acting on an object divided by the object's mass.
Circular Motion Is any motion in which an object is moving along a curved path
Centripetal Force In circular motion, a force that acts perpendicular to the direction of motion, toward the center of the curve.
Newton's Third Law of Motion When one object exerts a force on a second object, the second exerts equal force in the opposite direction on the first object.
Momentum Is the measure of how hard it is to stop a moving object.
Law of Conservation of Momentum The total momentum of a group of objects stays the same unless outside forces act on an object.
Created by: Kevfind