1. Potential Energy and
Conservation
of Energy

2. Conservative Forces When the system configuration changes, the force
does work (W1) transferring energy.
When the configuration change is reversed the force
reverses energy transfer, doing work (W2) in the process

3. Nonconservative Forces
A force that is not conservative is called nonconservative
force.
Kinetic friction and drag forces are nonconservative.

4. Path Independence of Conservative ForcesW1 W1 A B A B W2 W2

5. Gravitational Potential Energym h m

6. Spring Potential Energyk x k

7. Conservation of Mechanical Energy
The mechanical energy (Emec) of a system is
When no external forces act on a system
Conservation of
Mechanical Energy

8. Potential and Kinetic EnergyU K U K U K U K U K

9. Power Energy can be transferred from one form to another
through the process of work. The rate at which work
is done is called power
Average power
Instantaneous Power

10. Work done against gravityh m

11. Work done against gravitycm h M
Work required to lift one end

12. END ?