Question

which force was the first to be discovered?
gravity
weak nuclear force
strong nuclear force
electromagnetic force

Explanation:

Gravity has been observed and studied for centuries, with early - work by Galileo and Newton. The strong and weak nuclear forces were discovered much later in the 20th century as part of the development of nuclear physics. Electromagnetic force also had its key discoveries later in history compared to the long - known effects of gravity.

Answer:

Gravity