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Chapter 4 vocabulary
Introduction to Physics
19
Physics
7th Grade
10/16/2007

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Term

Force





(section 1)

Definition

a push or a pull exerted on an object

Term
net force





(section1)
Definition
the overall force on an object when all the individual forces acting on an object are added together
Term
unbalanced forces





(section 1)
Definition
a nonzero net force that changes an object's motion
Term
balanced forces





(section 1)
Definition
equal forces acting on an object in opposite directions
Term
inertia





(section 1)
Definition
the tendency of a moving object to continue in a straight line or of an stationary object to remain in place
Term
newton





(section 2)
Definition
a unit of measure that equals the force required to accelerate one kilogram of mass at a rate of one meter per second per second.
Term
friction





(section 3)
Definition
a force that one surface exerts on another when the two rub against each other
Term
sliding friction





(section 3)
Definition
friction that occurs when one solid surface slides over another
Term
rolling friction





(section 3)
Definition
the friction that occurs when an object rolls over a surface
Term
fluid friction





(section 3)
Definition
the friction that occurs when an object moves through a fluid
Term
gravity





(section 3)
Definition
the force that pulls objects toward each other
Term
free fall





(section 3)
Definition
the motion of a falling object when the only force acting on it is gravity
Term
projectile





(section 3)
Definition
an object that is thrown
Term
air resistance





(section 3)
Definition
the fluid friction experienced by objects falling through air
Term
terminal velocity





(section 3)
Definition
the maximum velocity a falling object achieves
Term
law of universal gravitation





(section 3)
Definition
the force of gravity acts between all objects in the universe
Term

momentum






(section 4)


Definition
the product of an object's mass and velocity
Term
law of conservation of momentum





(section 4)
Definition
the rule that the total momentum of objects in an interaction does not change
Term
equilbrium





(section 5)
Definition
a state in which opposing forces in a system are equally balanced or stable
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