Question

1. the output force is between the fulcrum and the input force for a bottle opener. which class of lever is a bottle opener? (1 point)

○ second
○ first
○ third

Explanation:

To determine the lever class, we recall the definitions:

• First - class levers: Fulcrum is between input and output forces (e.g., seesaw).
• Second - class levers: Output force (load) is between fulcrum and input force (effort) (e.g., wheelbarrow, bottle opener).
• Third - class levers: Input force is between fulcrum and output force (e.g., tweezers).

The problem states the output force (load from the bottle cap) is between the fulcrum (end of the bottle opener) and the input force (where we apply force to open). This matches the second - class lever definition.

Answer:

A. second