Lift problems

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Vikash

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Sep 29, 2020
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My dought is when there are 2 blocks rested on an lift that is accelerating downwards why is the block which is in contact with the lift below the first block have another force acting on it downwards additional to its weight? The force P marked on this diagram...
 

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Vikash said:
My dought is when there are 2 blocks rested on an lift that is accelerating downwards why is the block which is in contact with the lift below the first block have another force acting on it downwards additional to its weight? The force P marked on this diagram...
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That looks like block P's weight, to me. It makes sense that it would be pushing down on block Q.

But maybe you need to explain what each force is and what it is acting on; the diagram doesn't make such details clear. Making a separate diagram for each object could help.
 
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