Which is a first-class lever configuration?

Which is a first-class lever configuration?

• A. Fulcrum-Effort-Load
• B. Fulcrum-Load-Effort
• C. Load-Fulcrum-Effort
• D. Load-Effort-Fulcrum

Answer: (C)

A first-class lever has the fulcrum between the effort and the load, so the pivot sits in the middle with the two forces on opposite sides. In the configuration where the load is on one side, the fulcrum is in the middle, and the effort is on the other side, the fulcrum truly lies between load and effort. That arrangement matches the described first-class lever setup, making it the correct choice: Load-Fulcrum-Effort. The other sequences put the fulcrum at an end or have the effort between the fulcrum and load, which correspond to other lever types. A familiar example is the neck acting as a fulcrum with the head as the load and neck muscles applying the effort.

A first-class lever has the fulcrum between the effort and the load, so the pivot sits in the middle with the two forces on opposite sides. In the configuration where the load is on one side, the fulcrum is in the middle, and the effort is on the other side, the fulcrum truly lies between load and effort. That arrangement matches the described first-class lever setup, making it the correct choice: Load-Fulcrum-Effort. The other sequences put the fulcrum at an end or have the effort between the fulcrum and load, which correspond to other lever types. A familiar example is the neck acting as a fulcrum with the head as the load and neck muscles applying the effort.