Science questions xD?

Question

What type of lever is your arm? Your jaw?

Explain, using the length of effort arm, where the most powerful teeth in your mouth are located.

What type of lever is a rake?

Why will moving your hands making raking easier?

Answer 1

Both are type 3 levers, with force applied between fulcrum and load.

The back teeth are more powerful because they are closer to the fulcrum of the jaw.

A rake is also a type 3 lever.

With your hands spaced the same, moving them towards the load (the rake teeth) shortens the load lever arm while maintaining the force lever arm.