How do you find the acceleration of block B

AI Thread Summary
To find the acceleration of block B, the net force acting on it must be calculated using the applied force and the frictional force from block A. Block A, with a mass of 10 kg, exerts a frictional force on block B due to its weight and the coefficient of static friction. The total mass being accelerated is the sum of both blocks, and using Newton's second law (ma = sigma(F)), the correct acceleration can be derived. The initial calculation of 1.2 m/s² was incorrect, prompting a request for a detailed breakdown of the calculations to identify the error. Accurate calculations considering all forces and friction coefficients are essential for determining the correct acceleration of block B.
houssamxd
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Homework Statement


Block A sitting on top of block B
has a mass mA = 10 kg and is attached to the wall by mass less string.
Block B, mass mB = 35 kg, is pulled by a force F = 80 N. The surface
under block B is frictionless. If the coefficients of friction for block A
and B areμs = 0.4 and μk = 0.1, then the acceleration (in m/s2) of
block B is


Homework Equations


ma=sigma(F)

The Attempt at a Solution


i got my answer as 1.2
but its wrong
 
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hi houssamxd! :wink:

show us your full calculations, and then we'll see what went wrong, and we'll know how to help! :smile:
 

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