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Explain why the forces in our joints are several times
Chapter 9, Problem 12(choose chapter or problem)
Problem 12CQ
Explain why the forces in our joints are several times larger than the forces we exert on the outside world with our limbs. Can these forces be even greater than muscle forces (see previous Question)?
Reference previous Question:
Why are the forces exerted on the outside world by the limbs of our bodies usually much smaller than the forces exerted by muscles inside the body?
Questions & Answers
QUESTION:
Problem 12CQ
Explain why the forces in our joints are several times larger than the forces we exert on the outside world with our limbs. Can these forces be even greater than muscle forces (see previous Question)?
Reference previous Question:
Why are the forces exerted on the outside world by the limbs of our bodies usually much smaller than the forces exerted by muscles inside the body?
ANSWER:
Step 1 of 3
The ratio of output to input force is the mechanical advantage (MA) of a simple machine. Mathematically, it is written as, MA
Here, is the output force and
is the input force.
If the input force is applied at a distance
from a pivot point and the output force
is applied at a distance of
from the pivot, we can also express mechanical advantage as,
MA
…..(1)