With a few folds and some tape you can soon be launching soft projectiles. By Godwyn Morris and Paula Frisch The use of catapults can be traced to the Greeks, Romans and Chinese more than 2,000 years ...
Use a combination of simple machines to build a catapult. Use a combination of simple machines, a lever, and an axle to build a catapult, and then use the catapult to conduct a simple investigation ...
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