This preview shows pages 1–2. Sign up to view the full content.
Work
 Work – the product of 2 magnitudes
(scalar)
If we apply a force to an object and it
moves some distance along the same
line as the force, then we have done
work on the object.
 A small force acting over a large
distance gives the same work as a
large force acting over small distances
 Work done on an object does not
depend on whether the object moves
thru the distance d quickly or slowly
 Speed depends on rate at which work
is done
 When W=0 d=0
 When theta = 90, the work done by
the force is 0; W= Fdcos90 = 0
 Work done by force:
1)work is the component of force
in the direction of the displacement
times the magnitude of the
displacement
2)work is the component of
displacement in the direction of the
force times the magnitude of force
 work is positive if the force has a
component in the direction of motion (
90<theta<90)
work is zero if the force has no
component in the direction of motion
(90)
work is negative if the force has a
component opposite to the direction of
This preview has intentionally blurred sections. Sign up to view the full version.
View Full Document
This is the end of the preview. Sign up
to
access the rest of the document.
 Summer '08
 DAMazilu
 Physics, Force, Gravity, Work

Click to edit the document details