2. The work done on a particle that moves along a closed trajectory (where the initial and final positions are the same, or di = df) = 0) is zero.
3. The force can be written as the negative of the gradient of a potential energy function, i.e. .
When the only forces present in a system are conservative, mechanical energy is conserved.
Examples of conservative forces:
Example of a non-conservative force:
- ↑ Serway and Beichner, Physics for Scientists and Engineers, Fifth Edition