The lever where the load is between the fulcrum and the effort is which class?

The lever where the load is between the fulcrum and the effort is which class?

• A. Class 2
• B. Class 1
• C. Class 3
• D. None

Answer: (A)

A lever with the load between the fulcrum and the effort is a Class II lever. In this setup the fulcrum is at one end, the load sits between it and where you apply the force, and the effort is applied at the far end. Because the effort arm (distance from the fulcrum to where you push) is longer than the load arm (distance from the fulcrum to the load), the input force can be smaller than the load force, giving a mechanical advantage greater than one. A wheelbarrow is a classic example: the wheel acts as the fulcrum, the load sits in the bar between the wheel and the handles, and pushing at the handles moves the load more easily than lifting it directly. The other arrangements differ: the fulcrum is between effort and load in Class I, and the effort is between fulcrum and load in Class III, each with different advantages and typical uses.

A lever with the load between the fulcrum and the effort is a Class II lever. In this setup the fulcrum is at one end, the load sits between it and where you apply the force, and the effort is applied at the far end. Because the effort arm (distance from the fulcrum to where you push) is longer than the load arm (distance from the fulcrum to the load), the input force can be smaller than the load force, giving a mechanical advantage greater than one. A wheelbarrow is a classic example: the wheel acts as the fulcrum, the load sits in the bar between the wheel and the handles, and pushing at the handles moves the load more easily than lifting it directly. The other arrangements differ: the fulcrum is between effort and load in Class I, and the effort is between fulcrum and load in Class III, each with different advantages and typical uses.