The kind of catapult we're working on is called a trebuchet. It uses gravity to launch the tennis ball. We're redesigning a trebuchet that I had made last year with some middle schoolers.

These old catapults had a pouch on one end of a long wooden beam, with a large heavy weight at the other end. When the weight was released, gravity pulled it down, and the pouch on the other end ...

The Satellite Applications Catapult has upgraded its In-Orbit Servicing, Assembly and Manufacturing (ISAM) facility to add a gravity offload system. The large steel structure – to simulate ...

From using the kinetic energy stored in twisted ropes and sinews to launch projectiles, catapults were developed using hydraulics, gravity and air as propellants. Steam became a favourite with ...