Is a bottle opener class 1 lever 2 or 3 lever?

A lever is a simple machine that consists of a rigid object, such as a bar or beam, that is pivoted around a fixed point, known as a fulcrum. When a force is applied to the lever, it causes the object to rotate around the fulcrum.

Levers are classified into three classes based on the relative positions of the fulcrum, the input force, and the output force.

In a class 1 lever, the fulcrum is located between the input force and the output force. The input force is applied on one side of the fulcrum, and the output force is applied on the other side. Examples of class 1 levers include seesaws, crowbars, and pliers.

In a class 2 lever, the output force is located between the fulcrum and the input force. The input force is applied on one side of the fulcrum, and the output force is applied on the other side. Examples of class 2 levers include wheelbarrows, bottle openers, and nutcrackers.

In a class 3 lever, the input force is located between the fulcrum and the output force. The input force is applied on one side of the fulcrum, and the output force is applied on the other side. Examples of class 3 levers include tweezers, fishing poles, and human arms.

In the case of a bottle opener, the fulcrum is the point where the bottle opener contacts the bottle cap. The input force is applied by the hand, and the output force is applied to the bottle cap. Therefore, a bottle opener is a class 2 lever.