7. Two people are pushing on a \( 40 \mathrm{~kg} \). One is pashing with \( 250 \mathrm{~N} \) to the left and the other is pushing with a force of \( 180 \mathrm{~N} \) to the right. a) If the box is not moving, what is the frictional force? b) What is the coefficient of friction?
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(I) A force of 35.0 N is required to start a 6.0-kg box moving across a horizontal concrete floor. ($a$) What is the coefficient of static friction between the box and the floor? ($b$) If the 35.0-N force continues, the box accelerates at 0.60 m/s$^2$ What is the coefficient of kinetic friction?
DYNAMICS: NEWTON'S LAWS OF MOTION
Problems Involving Friction, Inclines
Two blocks (A and B) remain stuck together as they are pulled to the right by a force $F=200 \mathrm{~N}$ ( $\mathbf{r}$ Fig. 4.47 ). $\mathrm{B}$ is on a rough horizontal tabletop (coefficient of kinetic friction of 0.800 ). (a) What is the acceleration of the system? (b) What is the force of friction between the two objects?
(I) A force of 48.0 $\mathrm{N}$ is required to start a 5.0 -kg box moving across a horizontal concrete floor. (a) What is the coefficient of static friction between the box and the floor? (b) If the $48.0-\mathrm{N}$ force continues, the box accelerates at $0.70 \mathrm{m} / \mathrm{s}^{2} .$ What is the coefficient of kinetic friction?
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