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Unit B / Ch. 3

Science Terms / Unit B / Chapter 3

TermDefinition
force a push or a pull sup
gravity the force of attraction that exists between any two objects
mass the amount of matter in an object
weight a measure of the pull of gravity on an object's mass
newton in the metric system, the unit used to measure force or weight
net force the combination of all the forces acting on an object
balanced forces equal forces acting in opposite directions
relative motion the change in position of one object compared to the position of another
frame of reference the object an observer uses to detect motion
speed the distance an object moves in a certain period of time
instantaneous speed the speed at any given point
speedometer a device that shows instantaneous speed
velocity a measure of both the speed and direction of a moving object
acceleration the change in velocity during a particular time period
law a statement that describes events or relationships that exist in nature
inertia the resistance of an object to change in the state of motion
friction a force between surfaces that resists the movement of one surface past the other surface
air resistance the friction from air molecules hitting an object as the object moves through the air
Newton's First Law of Motion All objects resist changes in motion
Newton's Second Law of Motion Force = Mass x Acceleration / The force you need to move any object equals the mass of the object multiplied by the acceleration you want; objects accelerate in the direction of the force that acts on them
Newton's Third Law of Motion When one object exerts a force upon a second object, the second object exerts an equal and opposite force upon the first object
Created by: lleahy
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