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# Unit 4 Vocabulary

TermDefinition
distance length between two places
position object’s location compared to other things
motion change in an object’s position compared to a fixed object
speed how fast an object’s position changes with time at any given moment (speed= distance ÷ time)
velocity description of a moving object’s speed and direction
acceleration measure of the change in velocity during a period of time (acceleration = change in speed ÷ time)
force any push or pull on an object
contact force- force applied when two objects touch
noncontact force a force that one object can apply without touching
net force combination of all the forces acting on an object
balanced force forces acting on an object that combine to form a net force of zero
unbalanced force forces acting on an object that combine to form a net force that is not zero
gravity attractive force that exists between all objects that have mass
friction force that opposes the motion of an object
air resistance fluid friction between the surface of an object and the air
elastic force force exerted by a material when it is stretched or compressed
tension force pulling force applied when an object is stretched
Newton’s 1st law of motion an object at rest tends to stay at rest and an object in constant motion tends to stay in motion unless acted upon by an unbalanced force.
Newton’s 2nd law of motion acceleration depends on the object’s mass and the amount of net force applied to it
Newton’s 3rd law of motion when one object exerts a force on a second object, the second object exerts an equal force in the opposite direction on the first object (action, reaction forces)
Action force push of the first object on the second
Reaction force push of the second object back on the first
Created by: lindsaystagg123