rigging
1) in tree pruning or removal. method of using ropes and hardware to control or direct the descent of cut material or to handle heavy loads. 2) with cranes. loaders. or other equipment. method of using ropes and hardware to lift heavy loads.
reaction force
force of equal magnitude exerted in the opposite direction of a force acting on a body.
reactive force
force generated in response and opposite to another force. Important concept for safely operating a chain saw.