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Made it explicitly clear why P doesnt have to be averaged.
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Danu
Danu
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  1. Power is anThe expression $P=Fv$ expresses a relation between the instantaneous concept: there is no question of averagingpower, the force and the velocity. You don't have to average for it to be true.
  2. In your case, the velocity in constant. This implies that the net force is zero. Hence, the force propelling the car is equal and opposite to the friction force. We can then use the magnitude of the friction force.
  1. Power is an instantaneous concept: there is no question of averaging.
  2. In your case, the velocity in constant. This implies that the net force is zero. Hence, the force propelling the car is equal and opposite to the friction force. We can then use the magnitude of the friction force.
  1. The expression $P=Fv$ expresses a relation between the instantaneous power, the force and the velocity. You don't have to average for it to be true.
  2. In your case, the velocity in constant. This implies that the net force is zero. Hence, the force propelling the car is equal and opposite to the friction force. We can then use the magnitude of the friction force.
Source Link
Danu
Danu
  • 16.5k
  • 10
  • 70
  • 110

  1. Power is an instantaneous concept: there is no question of averaging.
  2. In your case, the velocity in constant. This implies that the net force is zero. Hence, the force propelling the car is equal and opposite to the friction force. We can then use the magnitude of the friction force.