- #1
Darkapostle8
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Homework Statement
Three identical 4 kg crates are stacked one on top of the other. You want to accelerate them as much as possible by pushing on the lower crate, but the forces of static friction between the surfaces of the crates max out at 25 N. What is the maximum acceleration you can achieve before the upper crates start to slide?
Homework Equations
f_max/m
The Attempt at a Solution
So I attemped this solution by taking the max force of 25 N and diving it by the mass of the creates (4kg) and got 6.25 m/s^2 but that is not being accepted by my online homework. I also did 4*3 for 12 and did 25/12 and it still didn't work and I'm not sure what I'm doing wrong.