Paper in notebooks is pushed and pulled as part of a friction test

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Photo credit: © Dorling Kindersley: Lorraine Johnson / Alamy / Afripics
License: Licensed
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Keywords: background, boy, colour, copy, education, educational, experiment, experimental, friction, hands, horizontal, image, learn, learning, notebooks, pages, paper, project, pull, push, science, scientist, shot, space, studio, teach, teaching, test, white