Two teams of kids design and build catapults to fling a tennis ball as ... The kind of catapult we're working on is called a trebuchet. It uses gravity to launch the tennis ball.

“Mike had this idea for a desktop trebuchet you could just snap together,” Murphy tells Co.Design ... a Ballista and a Catapult, respectively. Like the Trebuchette, the Ballista and ...

More than 1,400 secondary students from 150 secondary schools took part in the Inter-school Straw Trebuchet Design and Construction Competition at City University on Sunday, pitting their minds ...