Share: Obsessive-compulsive disorder (OCD) is an illness that causes people to have unwanted thoughts (obsessions) and to repeat certain behaviors (compulsions) over and over again.We all have habits and routines in our daily lives, such as brushing our teeth before bed.hare: Obsessive-compulsive disorder (OCD) is an illness that causes people to have unwanted thoughts (obsessions) and to repeat certain behaviors (compulsions) over and over again.
Leverage definition, the action of a lever, a rigid bar that pivots about one point and that is used to move an object at a second point by a force applied at a third. See more. Dictionary.com
Terms associated with levers: 1  Fulcrum: the pivot point of a lever. 2  Effort: the force applied to a lever. 3  Resistive force, load or resistance: force that resists the motion of the lever. 4  Moment arm: the perpendicular distance from the line of action of the force of the fulcrum. 5  Mechanical advantage: ratio of output force : input force.