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Discover! Work & Machines

Ron SimmonsCindy Barden

出版	Lorenz Educational Press, 2000-09-01
主題	Science / Physics / General
ISBN	07877045399780787704537
URL	http://books.google.com.hk/books?id=KYlUTyxYNjAC&hl=&source=gbs_api
EBook	SAMPLE

註釋

Activities explore the effects of simple machines. Lessons focus on the concepts of force, friction, gravity, and inertia. General background information, suggested activities, questions for discussion, and answers are included. Encourage students to keep completed pages in a folder or notebook for further reference and review.