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Forces & Laws of Motion Terms
Ch.4 Key Terms
13
Physics
Not Applicable
04/26/2004

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Term
Force
Definition
The cause of an acceleration, or the change in an object's velocity.
Term
Contact Force
Definition
Force that arises from the physical contact of two objects.
Term
Field Force
Definition
Force that can exist between objects, even in the absence of physical contact between the objects.
Term
Force Diagram
Definition
A diagram of the objects involved in a situation and the forces exerted on ther objects.
Term
Inertia
Definition
The tendency of an object to maintain its state of motion.
Term
Net External Force
Definition
The total force resulting from a combination of external forces on an object; sometimes called the resultant force.
Term
Equilibrium
Definition
The state in which there is no change in a body's motion.
Term
Action-Reaction Pair
Definition
A pair of simultaneous equal but opposite forces resulting from the interaction of two objects.
Term
Weight
Definition
The magnitude of the force of gravity acting on an object.
Term
Normal Force
Definition
A force exerted by one object on another in a direction perpendicular to the surface or contact.
Term
Static Friction
Definition
The resistive force that opposes the relative motion of two contacting surfaces that are at rest with respect to one another.
Term
Kinetic Friction
Definition
The resistive force that oposes the relative motion of two contacting surfaces that are moving past one another.
Term
Coefficent Friction
Definition
The ratio of the force of friction to the normal force acting between two objects.
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