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Work and Energy

Physics class description of work and energy
by

Michelle Sperle-Berg

on 6 March 2016

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Transcript of Work and Energy

Work and Energy
WHEN IS WORK DONE?
What force is doing
positive work
negative work

Just to make sure we got this.
A
force
that
Causes a
displacement
in the
same direction
as
the force
RELATIONSHIP BETWEEN WORK AND ENERGY
Energy
Work Can Be
Positive
or
Negative
So how does THAT work?
(no pun intended)
Work Can Be Positive or Negative
Grab a Calculator!
3 Components
In each photo identify the
object,
the type of force doing WORK

and
the object that WORK is being on.
Am I
working?
Work At An Angle
What component of the force is doing work?
ability to do work
Applied energy can do work
You and 5 of your friends are avid rock climbers. What variables would effect how much work you perform while climbing?
How about this one?
There are
2

forces
...hmm
A New Formula for Work
W = Fd Cos 0
Where THETA is the angle
between the
Force

and
Displacement
What are the values for the
following angles?

0 degrees
Now,
Tell me a Story.
Make it INTERESTING.
A story of positive work
A story with displacement
but no work
A story of negative work

Work
is
Not
a Vector
The Units for Work Are
Nm
or
FdCos0
http://www.physicsclassroom.com/mmedia/energy/au.cfm
-1
90 Degrees
FdCos0
0
FdCos0
180 Degrees
1
-1
Full transcript