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Voc: chpts 5-6

Vocabulary for physical science: chapters 5&6

QuestionAnswer
motion an objects change in position relative to a reference point
speed the distance traveled divided by the time interval during which the motion occurred
velocity the speed of an object in a particular direction
acceleration the rate at which velocity changes over time; an object accelerates if its speed, direction, or both change
force a push or a pull exerted on an object in order to change the motion of the object; force has size and direction
newton the SI unit for force (symbol, N)
net force the combination of all of the forces acting on an object
friction a force that opposes motion between two surfaces that are in contact
gravity a force of attraction between objects that is due to their masses
weight a measure of the gravitational force exerted on an object; its value can change with the location of the object in the universe
mass a measure of the amount of matter in an object
terminal velocity the constant velocity of a falling object when the force of air resistance is equal in magnitude and opposite in direction to the force of gravity
free fall the motion of a body when only the force of gravity is acting on the body
projectile motion the curved path that an object follows when thrown, launched, or otherwise projected near the surface of Earth; the motion of objects that are moving in two dimensions under the influence of gravity
inertia the tendency of an object to resist a change in motion unless an outside force acts on the object
momentum a quantity defined as the product of the mass and velocity of an object
Created by: Little Dreamer
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