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chap 5-6 vocab
Chapter Five Six vocab
Question | Answer |
---|---|
an object s change in position relative to a reference point | motion |
the distance traveled divided by the time interval during which the motion occurred | speed |
the speed of an object in a particular direction | velocity |
the rate at which velocity changes over time; an object accelerates if its speed, direction, or both change | acceleration |
a push or a pull exerted on an object in order to change the motion of the object; force has size and direction | force |
the SI unit for force (symbol, N) | newton |
the combination of all of the forces acting on an object | net force |
a force that opposes motion between two surfaces that are in contact | friction |
a force of attraction between objects that is due to their masses | gravity |
a measure of the gravitational force exerted on an object; its value can change with the location of the object in the universe | weight |
a measure of the amount of matter in an object | mass |
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 | terminal velocity |
the motion of a body when only the force of gravity is acting on the body | free fall |
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 | projectile motion |
the tendency of an object to resist a change in motion unless an outside force acts on the object | inertia |
a quantity defined as the product of the mass and velocity of an object | momentum |