How do tension catapults work and how are they used?

Tension or extension springs work by being stretched or bent, whereas torsion springs work by being twisted. Either kind of spring can be used to power a catapult, or a catapult can be built using weights rather than springs. Except for sports and hobbies, catapults are pretty much obsolete. read more

Tension or extension springs work by being stretched or bent, whereas torsion springs work by being twisted. Either kind of spring can be used to power a catapult, or a catapult can be built using weights rather than springs. read more