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I have repeatedly tried to find a way to understand "forces in a lift" questions and have repeatedly failed. Can anyone help?
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#2
the reaction R of the floor on the passenger causes most problems...
if the lift has acceleration a then the net force on the passenger divided by the mass of the passenger ( including any parcels etc being carried ) must equal a.
the net force will be mg - R if the acceleration is downwards, and R - mg if the acceleration is upwards.
if the lift has acceleration a then the net force on the passenger divided by the mass of the passenger ( including any parcels etc being carried ) must equal a.
the net force will be mg - R if the acceleration is downwards, and R - mg if the acceleration is upwards.
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#3
(Original post by kingflute)
I have repeatedly tried to find a way to understand "forces in a lift" questions and have repeatedly failed. Can anyone help?
I have repeatedly tried to find a way to understand "forces in a lift" questions and have repeatedly failed. Can anyone help?
It would be easier to explain if you put up a particular problem that you're having trouble with, too.
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(Original post by atsruser)
You need to understand the interactions of Newton's laws correctly. There's really nothing specific to forces in a lift. Maybe you could take a look at the Khan academy videos on Newton's laws?
It would be easier to explain if you put up a particular problem that you're having trouble with, too.
You need to understand the interactions of Newton's laws correctly. There's really nothing specific to forces in a lift. Maybe you could take a look at the Khan academy videos on Newton's laws?
It would be easier to explain if you put up a particular problem that you're having trouble with, too.
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#5
(Original post by kingflute)
It is as much knowing when to use overall forces or forces on an object in the lift or the lift itself, as anything else
It is as much knowing when to use overall forces or forces on an object in the lift or the lift itself, as anything else
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