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# Aqa physics unit 4 June 11 q 1a watch

1. 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.
http://filestore.aqa.org.uk/subjects...W-QP-JUN11.PDF

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
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(Original post by Puddles the Monkey)
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3. 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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