[Daryl]

The Lever uses a pivot point to multiply the force that can be applied to move a load. This is mechanical advantage. A form 1 Lever can move heavy loads with less effort, while a Form 3 Lever can move a Load faster than normal. You can swing a Clubhead faster than you can throw it.

I think that you can view the "counterweight trebuchet" as a dual lever: Form 1 and Form 3 while a Crowbar is Form 1 only.

The Golf Swing is dual Form 3. We don't have a choice. We also don't have much of a choice determining where the Force is Applied but we have more options in determining the source of the Force.