How Does Muscle Size Influence Lifting Capacity?

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AI Thread Summary
Larger muscles can lift more weight because they generate greater force, allowing them to perform more work as defined by the equation W = Fd. While the energy required to lift a specific mass remains constant, stronger muscles can apply more force, making lifting easier. The discussion also notes that mechanical advantage from longer bones can aid lifting but is separate from muscle size. Ultimately, muscle size directly correlates with lifting capacity due to the increased force output. Understanding these principles clarifies the relationship between muscle size and strength in lifting.
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Homework Statement


This isn't homework, just something I'm wondering.
Using the theories and links between Work and Energy, why is a larger muscle able to lift more (and/or find it easier to lift the same mass) than a smaller one?

Homework Equations


W = Fd
W = E_f - E_0
KE = (1/2)mv^2
PE = mgh
 
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A larger muscle can apply more force and so, since, W= fd, do more work. It takes exactly the same force and energy to lift a given object, whether the muscle is larger or not. It is just that the stronger (larger) muscle can apply more force. That's pretty much what "stronger" means!

It is also true that a longer arm might have more mechanical advantage and so be able to lift an object while applying less force (but using the same energy) but that is a matter of bone length, not muscle size or strength.
 

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