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Force and Motion
Lisa A. Boehm
其他書名
Types of Forces
出版Millmark Education, 2007-11
主題Science / Physics / General
ISBN16161860389781616186036
URLhttp://books.google.com.hk/books?id=r2WLlwEACAAJ&hl=&source=gbs_api
註釋A force is a push or pull that makes things move, stop, or change direction. It takes more force to move more mass. Gravity is a force that pulls things together. Friction is a force that slows things down and makes it harder to move them.