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SITEMAP School Physics Notes: Forces 5.1 Turning forces and skeletal muscles
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Forces 5 Turning forces: 5.7 Turning forces and the physics of the human skeleton and muscle system Doc Brown's Physics exam study revision notes Index of physics notes: 5. Turning forces, calculating moments, problem solving This page contains online questions only. Jot down your answers and check them against the worked out answers at the end of the page 5.7 Turning forces and the physics of the human skeleton and muscle system
Weight lifted and force calculations based on the action of muscles Repeat of calculations in biology notes from Part 3 of
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Worked out
ANSWERS to the moment calculations Remember 1 kg mass is equivalent to 10 N on the Earth's surface. Q1 F1 x d1 = F2 x d2, convert cm to m, 20 x 0.40 = F2 x 0.05, F2 = 20 x 0.40 / 0.05 = 160 N Q2 3 kg = 3 x 10 = 30 N, F1 x d1 = F2 x d2, convert cm to m, 30 x 0.36 = F2 x 0.06 x F2, F2 = 30 x 0.36 / 0.06 = 180 N Q3 F1 x d1 = F2 x d2, convert cm to m, 15 x 0.45 = F2 x 0.05, F2 = 15 x 0.45 / 0.05 = 135 N Q4 2 kg = 2 x 10 = 20 N, F1 x d1 = F2 x d2, convert cm to m, 20 x 0.48 = F2 x 0.06, F2 = 20 x 0.48 / 0.06 = 160 N Q5 F1 x d1 = F2 x d2, F1 x 0.50 = 150 x 0.05, F1 = 150 x 0.05 / 0.50 = 15 N Q6 F1 x d1 = F2 x d2, F1 x 0.60 = 180 x 0.06, F1 = 180 x 0.06 / 0.60 = 18 N, mass = 18 / 10 = 1.8 kg Q7 F1 x d1 = F2 x d2, F1 x 0.50 = 200 x 0.05, F1 = 200 x 0.05 / 0.50 = 20 N Q8 F1 x d1 = F2 x d2, F1 x 0.40 = 240 x 0.06, F1 = 240 x 0.06 / 0.40 = 36 N, mass = 36 /10 = 3.6 kg
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