WORK, ENERGY, AND ENERGY CONSERVATION Flashcards
is a scalar product (dot product) of two vectors
force and displacement.
Work
W=
Fdcosθ
When is work done positive?
Theta between zero to 89 degrees
When is work done positive?
Theta between zero to 89 degrees
When is work done negative?
Theta between 91 to 180 degrees
When is work done zero?
Theta equals 90 degrees
When is work done maximum?
Theta equals zero or 180 degrees
What happens to work done as the angle increases from 1
degree to 89 degree?
Work decreases
Attributed to mas and position.
Potential Energy
Associated with mass and speed
Kinetic Energy
If work is done on an object, it causes a change
in
kinetic energy
Positive work causes kinetic
energy to
increase
Negative work causes kinetic
energy to
decrease
The work done by causes a
change in gravitational potential energy
gravitational force
For a falling object, the gravitational
force and displacement are both
downward
