What characterizes a second-class lever?

A second-class lever is characterized by the resistance being located between the axis of rotation (fulcrum) and the applied force. This arrangement means that when force is applied to one end of the lever, the lever moves the load more effectively due to the mechanical advantage gained from this configuration. It allows the applied force to lift the resistance with a shorter distance of arm movement, demonstrating efficiency in lifting heavier loads with less input force.

In this type of lever, the fulcrum is positioned at one end, while the load is situated closer to the fulcrum than the point where the effort is applied. Common examples include a wheelbarrow or standing on tiptoes, where the ball of the foot acts as the fulcrum, the body weight is the resistance, and the effort is applied at the handles of the wheelbarrow or through the muscles in the leg. This unique placement of the elements provides significant leverage and makes second-class levers particularly effective for lifting tasks.