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16 January, 11:02

Someone is riding their bike across the beach, they are peddling forward with a force of 100 newtons and they are moving at a constant speed of 3 meters per second, what is the strength and direction of the force exerted by the friction from the sand against the bike?

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  1. 16 January, 12:55
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    100 Newtons

    Explanation:

    The rider moving without acceleration implies the net force is zero. The rider exerts force of 100 Newtons but something counteracts this force fully so that the resulting net force is zero, and that something is friction forces, as the text indicates. The magnitude of this force is exactly 100 Newtons and its direction is opposite to the direction of motion.
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