In good simulations, you can turn off gravity. Do this first. You want to study pure muscular force without the variable of weight.
By: Movement Science Desk Published: May 2026
Open a new tab. Visit phet.colorado.edu . Search for "Forces and Motions." Draw a pivot point (the joint) on a piece of paper. As you slide the force meters left and right, sketch what happens to the angle. Congratulations—you have just built a functional mental model of push-pull mechanics without spending a cent.
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