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This Concept Map, created with IHMC CmapTools, has information related to: tammy gravity, center of gravity is not always on the object, protons are positive, charged either positive, positive attracts negative, negative attracts positive, gravity causes an acceleration, electrons are negative, atoms contain a nucleus, gravity causes an acceleration, atoms contain electrons, acceleration is a change in velocity, movement is caused by force, gravity acts on all matter on Earth, magnetism is an invisible force, gravity is an invisible force, atoms or molecules are charged, friction is a visible force, all matter on Earth contain atoms or molecules, a nucleus contains protons & neutrons, charged either negative