Which is a first-class lever example?

• A. Neck extension
• B. Calf raise
• C. Bicep curl
• D. Jumping rope

Answer: (A)

First-class levers have the fulcrum between the effort and the load. In neck extension, the joint between the skull and the spine acts as the fulcrum; the weight of the head sits on the front side as the load, and the neck muscles apply force on the back to move the head. This arrangement matches the classic first-class lever pattern, so neck extension is the best example.

Calf raises fit as a second-class lever because the load (body weight) lies between the fulcrum (the ball of the foot) and the effort (the calf muscles). Bicep curls are a third-class lever since the effort from the biceps is applied between the elbow (fulcrum) and the weight in the hand (load). Jumping rope isn’t a single lever system with a clear fulcrum between effort and load; it uses multiple joints and levers in a coordinated way, so it’s not the best example of a first-class lever.