A push or pull on one object by another that is touching it
(Hint starts with a C)

contact force

Explanation:

Contact forces are forces that act between two objects that are physically touching each other.

he is very short, and he can only reach halfway up on the elevator buttons. but on a rainy day, he has his umbrella with him, and he uses it to poke the button at the top.

desert perennials often survive by remaining dormant during dry periods of the year, then springing to life when water becomes available. most annual desert plants germinate only after heavy seasonal rain, then complete their reproductive cycle very quickly.