1. Muscle Power Some Olympians only have their arm muscles to use when competing. So how much more power do your leg muscles add to an athletes overall body power? And is there any correlation between upper and lower body muscle power?

2. Experiment 1: Arm power 1.Measure the force needed to lift the sand bag using a Newtonmeter. Write this down. 2.Lift the sandbag 1m from the table to above your head as many times as you can in 60 seconds. Write down how many times you managed this. 3.The distance you moved the sandbag up each time is approximately 1m. 4.Work out your arm power as follows: Arm power = (Force x 1m x number of lifts)/ 60s = ________ Watts

3. Experiment 2: Leg power 1.Stand on the Newton scales and write down the approximate force your legs will be using to move your body. Write this down. 2.Now go up and down stairs as often as you can in 60 seconds. (WARNING: Do not go so fast that you trip and fall!) Write this down. 3.The distance between floors is 3.6m. 4.Leg power = (force x 3.6m x number of ups)/60s = _______ Watts

4. Class results Arm power /WLeg power/WArm power/WLeg power/W 115 216 317 418 519 620 721 822 923 1024 1125 1226 1327 1428

5. Conclusions What do your results show you about your arm and leg power? Is this true for the whole group? Plot a scatter graph of leg power (x-axis) against arm power (y-axis). Is there a correlation between the two? Do you think this would be the same for athletes from all sports? Which sports do you think would have different balances of arm and leg power (think of a swimmer compared to a cyclist)? Explain why you think this?