Question

question 9
which of the following is an example of a third - class lever?
broom
crowbar
bottle opener
corkscrew

Explanation:

To determine a third - class lever, we recall the definition: in a third - class lever, the effort is applied between the fulcrum and the load.

• A broom: When we use a broom, our hand (effort) is between the top of the broom (fulcrum) and the bristles (load) that are pushing against the dirt.
• A crowbar: It is a first - class lever, where the fulcrum is between the effort and the load.
• A bottle opener: It is a second - class lever (load between fulcrum and effort) or a first - class lever depending on the type, but not third - class.
• A corkscrew: It is not a lever (it uses a screw mechanism).

So the broom is an example of a third - class lever.

Answer:

A. Broom