Work, Power and Energy
Key Physics Terms
Key Concepts
•
Force
: Any influence that tends to accelerate an object; a push or
a pull. Measured in Newtons.
•
Distance:
The quantity that describes the position of an object.
•
Displacement:
The quantity that describes the change in
location of an object
and
includes
its direction of motion.
•
Velocity
: The distance an object travels per unit of time
including its direction of motion.
•
Acceleration:
Rate at which an object’s velocity changes with
time; this change
may
in
speed, direction, or both.
•
Vector:
A quantity that
represents
magnitude
(size) and
direction. It is usually represented with an arrow to indicate the
direction; the arrow may be drawn to scale.
•
Vector Component:
The perpendicular parts into which a vector
•
Work is done only when a force acts in the direction of
motion of an object.
•
If the force is perpendicular to the direction of motion, then no work
is done.
•
Power is the ratio of work done per unit time.
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