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# Motion

TermDefinition
motion a change in an object's position relative to a reference point
displacement the distance and direction of an objects change in position (start and stop)
speed the distance an object travels per unit of time
velocity includes speed of an object and the direction of its motion
momentum an object's mass and velocity
acceleration the rate of change of velocity
force a push or pull on an object
net force the sum of all of the forces acting on an object
unbalanced force the net force is not zero on an object
balanced force the net force is zero on an object
friction the force that opposes motion of objects in contact.
kinetic friction the force between two moving objects in contact
static friction the force between two objects in contact that are stationary
inertia the tendency of an object to resist a change in motion
gravity an attractive force between all objects that have mass
weight the gravitational force exerted on an object
Newton's First Law of Motion an object moves at a constant velocity unless an unbalanced force acts on it.
Newton's second law of motion an objects acceleration is in the same direction as the net force on the object and is equal to the net force divided by its mass.
Newton's third law of motion when one object exerts a force on a second object, the second object exerts a force on the first one that is equal in strength and opposite in direction
Air resistance a force that opposes 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 when gravity is the only force acting on an object
Law of conservation of momentum if no external forces act on a group of objects, their total momentum does not change.
Created by: PRO Teacher jhaase