Force applied by Muscles
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Give the steps for measuring the force applied by a muscle Given the example of an arm
• Calculate the moment 1) When a force acts on something that has a pivot it creates a turning effect called the moment. 2) the arm is the lever and the elbow is the pivot. so when the force acts on the arm there’s a moment 3) calculate the moment
What’s the equation for calculating the moment?
Moment (Nm) = Force (N) x Perpendicular distance (m)
Find the moment when you have a weight that has a force of 12N and is 0.3m calculate the moment
moment = 12 x 0.3 = 3.6Nm 3.6Nm = 12 x 0.3
What has to be the same to keep the arm still?
The moment of muscle has to be the same as the moment of the weight.
How do you work out the force?
Force = moment ÷ perpendicular distance
Calculate the force when the weight has a moment of 3.6 Nm and the pivot is 0.05m for distance
Force = 3.6Nm ÷ 0.05m 3.6Nm ÷ 0.05m = 72N