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M1 Pulleys question: where have I gone wrong?

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Original post by creativebuzz
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It appears that you have assumed that the block on the left and right both move upwards.

Note: Please get a better picture of your working next time (camera angle in particular).
Original post by creativebuzz


and the tensions in the two strings won't be the same, since otherwise the middle mass can't move.
Original post by tiny hobbit
and the tensions in the two strings won't be the same, since otherwise the middle mass can't move.



But it's an inextensible string..
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Avatar for davros
davros
16
Original post by creativebuzz
But it's an inextensible string..


There are two strings!
Pick a direction for the acceleration of the system, so one direction will be the positive direction and one will be negative
Original post by creativebuzz
But it's an inextensible string..


There are two different strings. You can't assume that they have the same tensions and in general they won't.
Original post by davros
There are two strings!



Wait, where does it state that there are two strings involved?
Reply 8
Avatar for davros
davros
16
Original post by creativebuzz
Wait, where does it state that there are two strings involved?


It says in the question - "inextensible light strings"!

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