strength or energy as an attribute of physical action or movement. --force--
the action or process of moving or being moved. ---motion
is the overall force acting on an object. In order to calculate the net force, the body is isolated and interactions with the environment or constraints are introduced as forces and torques forming a free-body diagram. --net force--
the strength and vitality required for sustained physical or mental activity. -- energy--
equal magnitude and opposite direction --balanced force--