Friction Quiz MULTIPLE CHOICE. Choose the one alternative that best completes th

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Friction Quiz MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. 1) A packing crate slides down an inclined ramp at constant velocity. Thus we can deduce that 1) A) a frictional force is acting on it. B) it is not acted on by appreciable gravitational force. C) a net upward force is acting on it. D) it is not acted on by appreciable normal force. E) a net downward force is acting on it. 2) A flatbed is carrying a crate along a level road. The coefficient of static friction between the 20 load and the bed is 0.40. The truck accelerates forward and the crate stays in its place on the truck bed. In what direction is the force that the bed exerts on the crate? A) backward B) forward C) toward the center of the road with respect to the bed. There is no frictional force because the cratedoes not move D) E There is not enough information to answer this question. FIGURE 6-1 In Figure 6-1, the block of massm is at rest on an inclined plane that makes an angled with the horizontal. The force of static frictionf must be such that A) f >ng sina. D)f >ms costa 4) A 50.0-kg bov is being pushed along a horizontal surface. The coefficient of kinetic friction for il between the box and the ground is 0.350. What horizontal force must be everted on the bov to accelerate at 1.20 m/s2? E) 172 N B) 491 N A) 116 N 50 A baseball player is running to second base at 5.03 m/s. When he is m from the plate he 50 480 goes into a slide. The coefficient of kinetic friction between the player and the ground is0.180. What is his speed when he reaches the plate? A) 196 m/s B) 2.56 m/s C) 4.47 m/s D) 289 m/s E) He stops before reaching the plate.

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