內容簡介top Forces and Motion 簡介 These giant books of projects and experiments take a hands-on approach to science concepts. Hundreds of simple and easy experiments explore various scientific principles behind natural phenomena like friction, centrifugal force, and the underlying laws of physics that help make machines work. These fun yet practical experiments make it easy for anyone to become a rocket scientist! What makes a wind-up toy move? Why do you oil your bicycle chain but not your brake pads? This book helps kids master the laws of force and motion through simple experiments they can conduct using common household items. Each experiment includes step-by-step, illustrated instructions as well as background information, studies, and results that help kids develop a deeper understanding of the concept.