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Dissipative Forces

Dissipative Forces. Reality?. In reality, non-conservative forces cannot be ignored: friction really does act Dissipative force is one that reduces the total mechanical energy The total energy is conserved, it is just converted into useless forms (heat from friction)

Dissipative Forces

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Presentation Transcript

1. Dissipative Forces

2. Reality? • In reality, non-conservative forces cannot be ignored: friction really does act • Dissipative force is one that reduces the total mechanical energy • The total energy is conserved, it is just converted into useless forms (heat from friction) • KE1 + PE1 = KE2 + PE2 + Dissipative Force

3. Friction Most Common • Friction depends on the distance traveled • Wf = Ffd • KE1 + PE1 = KE2 + PE2 + Ffd

4. Example • A 1000kg roller coaster car starting from a height of 40m is found to reach a vertical height of only 25m on the next hill. If the total distance traveled was 400m . Find the force of friction acting on the car.

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