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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.
    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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    Sorry you've not had any responses about this. Are you sure you've posted in the right place? Here's a link to our subject forum which should help get you more responses if you post there.

    You can also find the Exam Thread list for A-levels here and GCSE here. :dumbells:


    Just quoting in Puddles the Monkey so she can move the thread if needed
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    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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