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Physics Gr12
Physics Definitions(P1)
Work Energy Power
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Cards (6)
FΔxcos θ
work done on an object by a constant force the angle between the force and the displacement.
conservative force
work done
in moving an object between two points is independent of the path taken.
Examples are
gravitational force
,
work-energy theorem
:
The work done on an object by a
net force
is equal to the change in
kinetic energy
of the object
non-conservative force
:
work done in moving an object between two points depends on the path taken.
Examples are
frictional force
,
air resistance
,
tension
in a chord, etc.
principle of conservation of mechanical energy
The total mechanical energy (sum of
gravitational potential energy
and
kinetic energy
) in an
isolated
system remains constant.
NOTE: A system is isolated when the
net external force
(excluding the gravitational force) acting on the system is zero.
power
the rate at which
work
is done or energy is expended.
In symbols:
P = W/
∆t