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Physics Terms
definitions on chapter 4 terms
17
Physics
12th Grade
11/10/2013

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Term
Newton's First Law
Definition
"An object that is at rest will remain at rest, and an object that is moving will continue to move in a straight line with constant speed, if and only if the net force acting on the object is zero."
Term
force
Definition
A push or pull.
Term
interaction pair
Definition
two forces that are in opposite directions, have equal magnitudes, and act on different objects.
Term
Tension
Definition
a force exerted by any segment of a rope or string on an adjoining segment.
Term
net force
Definition
the vector sum of two or more forces acting on an object.
Term
equilibrium
Definition
if the net force on an object is zero
Term
Newton's Second Law
Definition

F=ma

 

"The acceleration of an object is directly proportional to the net force on it and inversely proportional to its mass."

Term
apparent weight
Definition
The supporting force acting upon the object.
Term
Contact Force
Definition
A force that acts on an object by touching it
Term
Newton's 3rd Law
Definition
"The two forces in an interaction pair act on different objects and are equal in magnitude and opposite in direction."
Term
normal force
Definition
A perpendicular contact force exerted by a surface on another object
Term
Inertia
Definition
The tendency of an object to resist changes in its motion
Term
free-body diagram
Definition
a dot represents an object and arrows represent each force acting on it, with their tails on the dot and their points indicating the direction of the force.
Term
terminal velocity
Definition
The constant velocity that a falling object reaches when the drag force equals the gravitational force
Term
weightlessness
Definition
when an object's apparent weight is zero, the object is in a state of ____.
Term
gravitational field
Definition
The vector quantity that relates an object's mass to the gravitational force it experiences at a given location.
Term
Weight
Definition
the gravitational force experienced by an object.
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