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PS9 Chapter 11 Terms
PS9 Chapter 11 Terms - Motion
12
Science
9th Grade
12/11/2008

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Term
law of universal gravitation
Definition
This says that the gravitational force increases as one or both masses increase and the gravitational force decreases as the distance between the masses increases
Term
momentum
Definition
A quantity defined as the product of the mass and velocity of an object (p=mv)
Term
newton
Definition
The force that can give a mass of 1kg and acceleration of 1 m/s2
Term
inertia
Definition
The tendency of an object to resist being moved or, if the object is moving, to resist a change in speed or direction until an outside force acts on the object
Term
Newton's first law
Definition
An object at rest remains at rest and an object in motion maintains it's velocity unless it experiences an unbalanced force
Term
Newton's third law
Definition
For every action force, there is an equal and opposite reaction force (the law of action and reaction)
Term
mass
Definition
The measure of the amount of matter in an object.
Term
weight
Definition
This is the gravitational force an object experiences because of its mass
Term
projectile motion
Definition
The curved path that an object follows when thrown, launched, or otherwise projected near the surface of the Earth; the motion of objects that are moving in two dimensions under the influence of gravity.
Term
free fall
Definition
The motion of a body when only the force of gravity is acting on the body.
Term
Newton's second law
Definition
The unbalanced force acting on an object equals the object's mass times it's acceleration. (F=ma)
Term
terminal velocity
Definition
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
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