Find the acceleration of the blocks

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To find the acceleration of the blocks when a 10 N force is applied to the 7 kg block, it is noted that the friction force between the 7 kg and 3 kg blocks is 15 N, which is greater than the applied force, causing them to move together as a single unit. The discussion emphasizes the importance of systematically applying Newton's second law (F = ma) to each block to determine their accelerations. There is confusion regarding whether the 4 kg block will have the same acceleration as the combined blocks or a different one. The participants suggest writing out the equations for each block to clarify the motion. Ultimately, a systematic approach is necessary to solve for the accelerations accurately.
jyothsnapb
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Homework Statement



Find the acceleration of the blocks if a horizontal force of 10 N is applied on the 7 kg block.
u1, u2 and u3 are the coefficients of friction. refer diagram. thanks in advance

Homework Equations





The Attempt at a Solution



the force of friction between 7 kg and 3 kg is 15 N which is more than the applied force so they will move together like a single block. I am confused abt the motion of the 4 kg block will it move with a different acceleration or same?
 

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hi jyothsnapb! :wink:

do questions like this systematically …

call the accelerations of the three blocks a1 a2 and a3,

then write out F = ma equations for each block …

what do you get? :smile:​
 
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