That is not quite right, both joint can rotate through the axis perpendicular to the joint,
but a universal is used for power transmission like you drive shaft in you car, where a
ball joint (ball and socket joint) is used to change directional force like your hip joint or
where your a-frame ties to your spindle in the front suspension of you car.
Hope this helps.
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RE: What is the difference between ball joints and universals?posted in SketchyPhysics