Activity: Power and efficiency

IB Physics: Activity: Power and efficiency

Work done per unit timeUnit Js-1 or watt (W)ScalarConsider the simple machine shown below.The point of the machine is to increase the speed of the block. The mass of the block is 1 kg and the tension in the string is 1 N. Distance travelled is 2mEfficiency is define by the equationIf we now add friction to the machineThe tension in the string is still the same.

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