Magnitude

Figure 6-35 shows three crates being pushed over a concrete floor by a horizontal force 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 F32more than, less than, or the same as it was when the coefficient was 0.700?

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