What simple machine is in the ballpoint pen?
None of the classic simple machines are in a ballpoint pen.
It does use the ball bearing to reduce friction. In using the pen, you normally use a lever motion, but there is no mechanical advantage.
A Hungarian named Laszlo Biro is generally credited with inventing the modern ballpoint pen. Biro was born in 1899. He showed an early version of the pen at an international fair in 1931, when he was 32 years old. The first patent on a ballpoint pen for marking leather was filed in 1888 by Kayleigh Loud but was not good for writing on paper.
Laszlo Biro invented the first ballpoint pen in 1938, which is why ballpoint pens are also known as a 'Biro.' He is the most commonly known inventor of the pens, but other people invented different kinds of pens, such as the foundation pen. quill / Parker quill / Parker L.E. Waterman of New York designed the first workable fountain pen in 1884. Lazlo Biro patented the first ballpoint pen in 1938. The principle of the…