3. An artist wearing spiked shoes pushes two crates across her frictionless horizontal studio floor. (See Figure 5.26.) If she exerts a horizontal \( 36 \mathrm{~N} \) force on the smaller crate, then the smaller crate exerts a force problem 3 . on the larger crate that is closest to A. \( 36 \mathrm{~N} \). B. \( 30 \mathrm{~N} \). C. \( 200 \mathrm{~N} \). D. \( 240 \mathrm{~N} \).
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A $136-\mathrm{kg}$ crate is at rest on the floor. A worker attempts to push it across the floor by applying a 412-N force horizontally. (a) Take the coefficient of static friction between the crate and floor to be $0.37$ and show that the crate does not move. (b) A second worker helps by pulling up on the crate. What minimum vertical force must this worker apply so that the crate starts to move across the floor? $(c)$ If the second worker applies a horizontal rather than a vertical force, what minimum force, in addition to the original 412-N force, must be exerted to get the crate started?
ao Figure $6-32$ shows three crates being pushed over a concrete floor by a horizontal force $\vec{F}$ of magnitude $440 \mathrm{~N}$. The masses of the crates are $m_{1}=30.0 \mathrm{~kg}, m_{2}=10.0$ $\mathrm{kg}$, and $m_{3}=20.0 \mathrm{~kg}$. The coefficient of kinetic friction between the floor and each of the crates is $0.700 .$ (a) What is the magnitude $F_{32}$ of the force on crate 3 from crate $2 ?$ (b) If the crates then slide onto a polished floor, where the coefficient of kinetic magnitude $F_{32}$ more than, less than, or coefficient was $0.700 ?$
Figure 6-32 shows three crates being pushed over a concrete floor by a horizontal force of magnitude 425 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?
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