Chapter 6, Problem 26P

GO Figure 6-32 shows three crates being pushed over a concrete floor by a horizontal force $\stackrel{\to }{F}$ of magnitude 440 N. The masses of the crates are m₁= 30.0 kg, m₂ = 10.0 kg, and m₃ = 20.0 kg. The coefficient of kinetic friction between the floor and each of the crates is 0.700. (a) What is the magnitude F₃₂ of the force on crate 3 from crate 2? (b) If the crates then slide onto a polished floor, where the coefficient of kinetic friction is less than 0.700, is magnitude F₃₂ more than, less than, or the same as it was when the coefficient was 0.700?

Figure 6-32 Problem 26.