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# Chapter 3 Vocabulary

### Chapter 3Vocabulary

TermDefinition
Force A push or pull.
Net Force The sum of all the forces acting on an object.
Friction The force that opposes the sliding motion of two surfaces that are touching each other.
Gravity An attractive force between any two objects that depend on the masses of the objects and the distance between them.
Weight The gravitational force exerted on an object.
Newton's First Law of Motion States that an object moves at a constant velocity unless an unbalanced force acts on it.
Inertia The tendency of an object to resist any change in its motion.
Newton's Second Law of Motion States an object's acceleration is in the same direction as the net force on the object and is equal to the net force exerted on it divided by its mass.
Newton's Third Law of Motion States that when one object exerts a force on a second object, the second object exerts a force on the first that is equal in strength and opposite in direction.
Air Resistance A friction-like force that opposes the motion of objects that move through the air.
Terminal Velocity The maximum speed an object will reach when falling through a substance, such as air.
Free Fall If gravity is the only force acting on an object, it is in this.
Centripetal Force A force exerted toward the center of a curved path.
Law of Conservation of Momentum If no external forces act on a group of objects, their total momentum does not change.
Created by: 19inmmor