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Aqa physics unit 4 June 11 q 1a

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Why bother with a post grad? Are they even worth it? Have your say! 26-10-2016
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    Explain what would happen to the magnitude of R if the van passed over the bridge at a higher speed. What would be the significance of any van speed greater than 15 m s–1? Support your answer with a calculation.

    The answer says that when reaction force is 0 the the parcel is not in contact with the van floor , but why would this happen? I though that if the reaction force is 0 then the only force acting on the parcel is its weight vertically downwards ???

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    Just quoting in Puddles the Monkey so she can move the thread if needed
    (Original post by Puddles the Monkey)

    The reaction force (from netwons 3rd law) is the opposite force exerted. So when this is 0 the opposite forces (weight) also are 0
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