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    • Diagram of 2 people on skateboards demonstrating forces.
    Rights: The University of Waikato Te Whare Wānanga o Waikato Published 30 November 2011 Size: 90 KB Referencing Hub media

    Forces always come in pairs. If one person on a skateboard pushes another person, both skateboarders are pushed apart with equal but opposite forces.

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      Rockets and thrust

      What is a rocket pushing against to make it start moving? Is it pushing against the ground? The air? The flames? To make any object start moving, something needs to push against something else ...

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