Work is a product of force and distance Remember that force is not only mass but also gravity. eg: If we lift a 5kg weight up a distance of 2m. Work = force x distance Work = (5 x 9.81) x 2 = 98.1 J Input force in Kg: Input the distance travelled: The work performed = This is how we can put the figures in the calculator. Work = x 9.81 x =

When working out Work and Power done on a Bench Step Work = body weight (kg) x distance of each step x steps taken in a minute x minutes performed. eg. BW = 70kg, 0.5 meter a step, 30 steps a min, over 10 minutes. We first need to multiply the persons mass x gravity to get body weight. Body weight = 70kg x 9.81 = 686.7N Body Mass = Body weight = This is how we can put the figures in the calculator. Body Weight = x 9.81 = We then multiply the body weight by the distance travelled in a minute. Distance = 0.5 meter x 30 steps = 15 meters Work = Distance x Body Weight x Time Work = 686.7 N x 15meters x 10 seconds = 103005 Joules Size of step = Number of steps in a minute = Number of minutes = Work = This is how we can put the figures in the calculator. Work = x x x = To convert Joules (J) to KiloJoules (KJ) we need to divide the amount of joules by 1000 KJ = Joules / 1000 KJ = 103005 / 1000 = 103 KJ This is how we can put the figures in the calculator. Work = J / 1000 = KJ We can now work out Power. Power = Work / Time in seconds If we want to work out the amount of seconds we multiply the amount of minutes by 60 eg. 2min = 2 x 60 = 120 seconds. This is how we can put the figures in the calculator Time = x 60 = To find out power we divide the amount of work done by the time in seconds. Power = / =

Measurement of Work and Power Cycle Ergometer.

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