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Unformatted text preview: Page 1 Practice Test 2 Name: __________________________ Date: _____________ 1. 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 D) can have units of newtons E) none of the above 2. A forward horizontal force of 12 N is used to pull a 240N crate at constant velocity across a horizontal floor. The coefficient of friction is: A) 0.5 B) 0.05 C) 2 D) 0.2 E) 20 3. A crate rests on a horizontal surface and a woman pulls on it with a 10N force. No matter what the orientation of the force, the crate does not move. Rank the situations shown below according to the magnitude of the frictional force of the surface on the crate, least to greatest. A) 1, 2, 3 B) 2, 1, 3 C) 2, 3, 1 D) 1, 3, 2 E) 3, 2, 1 4. A car is traveling at 15 m/s on a horizontal road. The brakes are applied and the car skids to a stop in 4.0 s. The coefficient of kinetic friction between the tires and road is: A) 0.38 B) 0.69 C) 0.76 D) 0.92 E) 1.11 Page 2 5. A 400N block is dragged along a horizonatl surface by an applied force as shown. The coefficient of kinetic friction is u k = 0.4 and the block moves at constant velocity. The magnitude of is: A) 100 N B) 150 N C) 200 N D) 290 N E) 400 Nb 6. Block A, with a mass of 10 kg, rests on a 35 incline. The coefficient of static friction is 0.40. An attached string is parallel to the incline and passes over a massless, frictionless pulley at the top. The largest mass m B , attached to the dangling end, for which A remains at rest is: A) 2.5 kg B) 3.5 kg C) 5.9 kg D) 9.0 kg E) 10.5 kg 7. A ball is thrown downward from the edge of a cliff with an initial speed that is three times the terminal speed. Initially its acceleration is A) upward and greater than g B) upward and less than g C) downward and greater than g D) downward and less than g E) downward and equal to g Page 3 8. An object of mass m and another object of mass 2 m are each forced to move along a circle of radius 1.0 m at a constant speed of 1.0 m/s. The magnitudes of their accelerations are: A) equal B) in the ratio of 2 : 1...
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 Spring '08
 Maguire
 Physics, Force, Friction

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