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Science Unit 3 study material Scientific Method https://www.sciencebuddies.org/science-fair-projects/science-fair/steps-of-thescientific-method Contact and non-contact forces http://www.dynamicscience.com.au/tester/solutions1/magicofsci/contactandnoncon tactforces.html Friction https://www.ducksters.com/science/friction.php Gravity https://spaceplace.nasa.gov/what-is-gravity/en/ States of matter https://www.theschoolrun.com/what-are-states-matter