levers

• first class levers have the fulcrum in the middle, examples include flexion and extension of the neck and extension of the elbow
• second class levers have the load in the middle for example planterflexion at the ankle
• third class levers have the effort in the middl, this includes all other joints and ankle movements like the hip, knee and elbow extension
• second class levers have mechanical advantage as the load arm is shorter than the effort arm giving a mechanical advantage for strength. it can generate much large forces and has to life the whole body weight
• third class levers have a shorter effort arm than load arm therefore giving them a mechanical disadvantage for speed giving it a large range of movement and any resistance can be moved quickly