Activity: Power and efficiency

IB Physics: Activity: Power and efficiency

Work done per unit timeUnit Js-1 or watt (W)ScalarWhen a car travels at constant velocity the horizontal forces are balanced, the forward force exerted by the engine = the air resistance.Work done = force x displacementShow that in this case:Power = Force x velocityThe air resistance is proportional to velocity2. Explain why, to achieve a high top speed, a car needs a powerful engine.


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