Joint Push Pull Interactive Free: New!

In good simulations, you can turn off gravity. Do this first. You want to study pure muscular force without the variable of weight.

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Slide the "Push" force to 100%. Note the joint angle. Slide the "Pull" force to 100%. Note the opposite angle. Now, set both to 100% simultaneously. In a real joint, this creates isometric contraction (no movement, high stability). In good simulations, you can turn off gravity

Hide all distractions. If you are using a full-body model, lock the shoulder and wrist. Only allow movement at the elbow or knee. For more deep dives into free movement science

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.