<P> Levers are classified by the relative positions of the fulcrum, effort and resistance (or load). It is common to call the input force the effort and the output force the load or the resistance . This allows the identification of three classes of levers by the relative locations of the fulcrum, the resistance and the effort: </P> <Ul> <Li> Class 1: Fulcrum in the middle: the effort is applied on one side of the fulcrum and the resistance (or load) on the other side, for example, a seesaw, a crowbar or a pair of scissors . Mechanical advantage may be greater than, less than, or equal to 1 . </Li> <Li> Class 2: Resistance (or load) in the middle: the effort is applied on one side of the resistance and the fulcrum is located on the other side, for example, a wheelbarrow, a nutcracker, a bottle opener or the brake pedal of a car . Load arm is smaller than the effort arm . Mechanical advantage is always greater than 1 . It is also called force multiplier lever . </Li> <Li> Class 3: Effort in the middle: the resistance (or load) is on one side of the effort and the fulcrum is located on the other side, for example, a pair of tweezers or the human mandible . The effort arm is smaller than the load arm . Mechanical advantage is always less than 1 . It is also called speed multiplier lever . </Li> </Ul> <Li> Class 1: Fulcrum in the middle: the effort is applied on one side of the fulcrum and the resistance (or load) on the other side, for example, a seesaw, a crowbar or a pair of scissors . Mechanical advantage may be greater than, less than, or equal to 1 . </Li> <Li> Class 2: Resistance (or load) in the middle: the effort is applied on one side of the resistance and the fulcrum is located on the other side, for example, a wheelbarrow, a nutcracker, a bottle opener or the brake pedal of a car . Load arm is smaller than the effort arm . Mechanical advantage is always greater than 1 . It is also called force multiplier lever . </Li>

Where is the fulcrum located in a first class lever