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C7 : Conversation of Energy, Non conservative forces:
Friction
Heat
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Non conservative forces:
- Friction
- Heat
- Electrical Energy
- Chemical Energy
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Energy can neither increased
nor decreased , it can be transformed
from one form to another but
the total amount remains constant
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There are no non conservative forces,
the sum of changes KE and PE is zero,
So, its equal but opposite sign
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PRINCIPLE OF CONSERVATION OF MECHANICAL ENERGY
If conservative forces are doing work, the total mechanics energy of a system neither increases nor decreases in any process and stay constant - conserve
TIPS
- Draw a picture
- Determine the system for which energy will conserved
- Figure out what you looking, initial and final position
- Choose a logical reference frame
- Apply Conservation of energy
- SOLVE
Also can described as the rate at which energy is transformed
Power also needed for acceleration & for moving against force of friction
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