1111_Fa17_Exam2_P7_A_solns.pdf

There is no penalty for guessing 1 the net force on a

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in the box provided. There is no penalty for guessing. 1. The net force on a moving object is suddenly reduced to zero and remains zero. As a consequence, the object C A. stops abruptly. B. stops during a short time interval. C. continues moving at constant velocity. D. changes velocity in an unknown manner. 2. If a tire hangs at rest from a (massless) rope attached to a tree limb, then the tension in the rope is equal and opposite to the weight of the tire. Which one of the following principles of physics best explains this result? B A. Newton’s Law of Universal Gravitation. B. Newton’s Second Law. C. Newton’s Third Law. D. The Law of Conservation of Momentum. 3. A constant horizontal force is applied to a box initially at rest on a frictionless table. The force acts for a short time interval and gives the box a certain final speed. To reach the same final speed with a force that is only half as big, the force must be exerted on the cart for a time interval that for the stronger force. C A. half as long as B. equal to C. twice as long as D. four times as long as Copyright c 2017 University of Georgia. 2

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Physics 1111 Exam #2 2:30-A Solutions 13 October 2017 Last Name: II: Order/Choice Questions (24 points) For each question below, write your responses in capital letters in the space provided. The following diagrams show blocks sliding across rough, horizontal surfaces. For each block, the mass, initial speed, and coefficient of kinetic friction are given. v 0 = 3 m/s 2 kg μ k = 0.25 A v 0 = 4 m/s 1 kg μ k = 0.15 B v 0 = 1 m/s 6 kg μ k = 0.18 D v 0 = 2 m/s 4 kg μ k = 0.15 C 1. Rank the blocks on the basis of the magnitude of work friction must do in order to bring the block to a halt. Rank the blocks in increasing order, and be sure to indicate if any two works are equal. Use less-than symbols and equals signs ( < , =) to indicate rankings. D < B = C < A 2. Rank the blocks on the basis of magnitude of the kinetic friction force acting on them. Rank the blocks in increasing order, and be sure to indicate if any of the kinetic friction forces are equal. Use less-than symbols and equals signs ( < , =) to indicate rankings. B < A < C < D Copyright c 2017 University of Georgia. 3
Physics 1111 Exam #2 2:30-A Solutions 13 October 2017 Last Name: III: Blocks and Pulleys (28 points) The figure shows a block of mass m 1 on a friction- less incline of angle θ = 27 . 0

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• Spring '08
• plascak
• Physics, Cooley, Physics, Phys1111

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