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Chapter 6 (Exam 2)
Work and Energy
14
Physics
Undergraduate 2
02/09/2015

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Term
conservative force
Definition
a force in which the work it does on a moving object is independent of the path between the object's initial & final positions; a force which does no net work on an object moving around a closed path, starting & finishing at the same point
Term
The kind of path which begins & ends at the same place is called a _____ path
Definition
closed
Term
The concept of _____ is not defined for a non-conservative force
Definition
potential energy
Term
Is friction a conservative or a non-conservative force?
Definition
non-conservative
Term
Is gravity a conservative or a non-conservative force?
Definition
conservative
Term
total mechanical energy "E"
Definition
the sum of kinetic energy & potential energy
Term
If no non-conservative forces act on an object, the total mechanical energy _____
Definition
remains constant all along the path between the initial & final points
Term
A quantity that remains constant throughout motion is said to be _____
Definition
conserved
Term
principle of conservation of mechanical energy
Definition
the fact that the total mechanical energy is conserved when "Wnc" = 0J
Term
power
Definition
incorporates both the concepts of work & time; work done per unit time; average rate at which work "W" is done; denoted "P bar"
Term
SI unit of power
Definition
joule/s = watt (W)
Term
Is power a scalar or a vector?
Definition
scalar
Term
the principle of conservation of energy
Definition
energy can neither by created nor destroyed, but can only be converted from one form to another
Term
The work done by a variable force in moving an object is equal to _____
Definition
the area under the graph of:
F(cos "theta") versus "s"
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