C. mF/(M —m)D. MF/(M +m) ans: A 68. Two blocks (A and B) are in contact on a horizontal frictionless surface. A 36-N constant force is applied to A as shown. The magnitude of the force of A on B is: ma =4.0kg 36N A B mp = 20kg N AR AR AR AR RN N\ A. 15N B. 6.0N C. 29N D. 30N E. 36N ans: D 69. A short 10-g string is used to pull a 50-g toy across a frictionless horizontal surface. If a 3.0 x 1072-N force is applied horizontally to the free end, the force of the string on the toy, at the other end, is: A. 0.15N B. 6.0x1073NC. 25x10"2ND. 3.0x10"2NE. 3.5 x 102N ans: C Chapter 5: FORCE AND MOTION I 65 65 Chapter 6: FORCE AND MOTION II 1. A brick slides on a horizontal surface. Which of the following will increase the magnitude of the frictional force on it? A. Putting a second brick on top B. Decreasing the surface area of contact C. Increasing the surface area of contact D. Decreasing the mass of the brick E. None of the aboveans: A 2. The coefficient of kinetic friction: A. is in the direction of the frictional force B. is in the direction of the normal force C. is the ratio of force to area (I 12:48 am Content 66/655
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