A lemon squeezer is a second-class lever.
This classification is based on the relative positions of the fulcrum, effort, and load. In a second-class lever, the fulcrum is located at one end, the load is in the middle, and the effort is applied at the other end.
When you squeeze a lemon in a squeezer, the fulcrum is the point where the handle pivots. The load is the lemon itself, which is being compressed. The effort is applied by your hand on the handle, located at the opposite end of the lever.
This setup provides a mechanical advantage, meaning that you can exert less force on the handle to generate a greater force on the lemon. This is why lemon squeezers make it easier to extract juice from a lemon compared to squeezing it by hand.
Here are some other examples of second-class levers:
* A wheelbarrow
* A bottle opener
* A nutcracker