What Does Force Represent in the Equation P=Fv?

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SUMMARY

In the equation P=Fv, force (F) represents the net force required to maintain motion against resistive forces. For a car with a mass of 1000 kg traveling at a constant velocity of 30 m/s and powered by an engine producing 25 kW, the calculated force is 833.33 N. This force counteracts resistive forces, such as friction, which also equals 833.33 N. An increase in power will result in either an increase in force or velocity, depending on the system's constraints.

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In the equation P=Fv, I am unsure of what exactly the force reprents. Let's say that there is a car of mass 1000kg traveling at a constant velocity 30m/s, driven by an engine developing 25kW. Since F=P/v, F= 833.33N. However, this is clearly not the resultant force on the car - since the resultant force is 0N. Does this mean that resistive forces must be 833.33N? If so, please can someone explain why a force is needed for this motion? Also, if the power were to be increased, would the force increase, or the velocity increase?

Thanks
 
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You've already explained it. You've computed the force that the engine is applying to the car to overcome the friction force. So, yes, the friction force is 833.33N.
 

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