Javadoc
Manually clear the force buffer on all bodies. By default, forces are cleared automatically after each call to Step. The
default behavior is modified by calling SetAutoClearForces. The purpose of this function is to support sub-stepping.
Sub-stepping is often used to maintain a fixed sized time step under a variable frame-rate. When you perform sub-stepping
you will disable auto clearing of forces and instead call ClearForces after all sub-steps are complete in one pass of your
game loop.
#setAutoClearForces(boolean)