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# Science Unit 2 Test

TermDefinition
gravity the force of attraction between two objects
The Law of Universal Gravitation States that all objects in the universe are attracted to each other. Describe the relationship among gravitational force, mass and distance.
Weight The measure of gravitational force on an object. Unit - Newtons
Mass The amount of matter in an object. Unit - kg
Air Resistance (drag) The force that opposes the motion of objects falling through the air.
Projectile Motion The curved path that an object follows when it is thrown near the surface of the Earth. It is a combination of horizontal and vertical motion.
Centripetal Force The unbalanced force that causes an object to move in a circular path.
Orbit When one object in space makes a circular path around another due to gravity and horizontal motion.
Inertia The tendency of an object to resist a change in motion.
Newton's First Law of Motion When an object is at rest, it will stay at rest. When an object is in motion it stays in motion unless acted on by an outside force.
Newton's Second Law of Motion The acceleration of an object depends on the mass of the object and the force applied.
Newton's Third Law of Motion When one object exerts a force on a second object, the second object exerts an equal and opposite force back on the first object.
Terminal Velocity When the force of gravity is equal to the force of air friction on a falling object, the net force is 0.
Freefall When gravity is the only force acting on an object, the object is in __________.
acceleration A change in velocity. Or a change in either speed or direction. Unit - m/s
Created by: slemieux