Gizmos and Gadgets

ISBN: 9781885593269

出版社: Ideals Pubns

出版年: 1999-6

页数: 144

定价: $ 14.63

装帧: Pap

内容简介

Kids will have a blast investigating the hows and why of motion, friction, gravity, energy, balance, and spinning by constructing awesome working contraptions. Find out how parachutes, catapults, hovercraft, and whirligigs work -- and more