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Dissipative Forces in Reality

Explore the impact of non-conservative forces like friction on mechanical energy. Learn how dissipative forces convert energy into useless forms, affecting energy conservation. Calculate friction force in a roller coaster example.

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Dissipative Forces in Reality

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  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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