ch04-QZ - Cutnell/Johnson Physics 8th edition Classroom...

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Cutnell/Johnson Physics 8th edition Classroom Response System Questions Chapter 4 Forces and Newton’s Laws of Motion Interactive Lecture Questions
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4.11.3. A team of dogs pulls a sled of mass 2 m with a constant force . A second sled of mass m is attached by a rope and pulled behind the first sled. The tension in the rope is . Assuming frictional forces are too small to consider, determine the ratio of the magnitudes of the forces and , that is, P/T . a) 3 b) 2 c) 1 d) 0.5 e) 0.33 P ur T ur P ur T ur
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4.12.3. A block of mass m is pressed against a wall with an initial force and the block is at rest. The coefficient of static friction for the block against the wall is equal to 0.5. The coefficient of kinetic friction is less than the coefficient of static friction. If the force is equal to the weight of the block, which one of the following statements is true? a) The block will continue to remain at rest because the force of static friction is two times the weight of the block. b) The block will slide down the wall because the force of static friction is only equal to one-half of the block’s weight. c) The block will accelerate at 9.8 m/s2 down the wall. d) The block will slide down the wall at constant speed. e) The block will accelerate at less than 4.9 m/s2 down the wall. F ur F ur
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4.12.4. A force of magnitude F pushes a block of mass 2 m , which in turn pushes a block of mass m as shown. The blocks are accelerated across a horizontal, frictionless surface. What is the magnitude of the force that the smaller block exerts on the larger block? a) F /3 b) F /2 c) F d) 2 F e) 3 F
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4.2.1. A pipe is bent into the shape shown and oriented so that it is sitting horizontally on a table top. You are looking at the pipe from above. The interior of the pipe and the table surface are smooth. A marble is shot into one end and exits the other end. Which one of the paths shown in the drawing will the marble follow when it leaves the pipe? a) 1 b) 2 c) 3 d) 4 e) 5
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4.2.2. If an object is moving can you conclude there are forces acting on it? If an object is at rest, can you conclude there are no forces acting on it? Consider each of the following situations. In which one of the following cases, if any, are there no forces acting on the object? a) A bolt that came loose from a satellite orbits the earth at a constant speed. b) After a gust of wind has blown through a tree, an apple falls to the ground. c) A man rests by leaning against a tall building in downtown Dallas. d) Sometime after her parachute opened, the sky diver fell toward the ground at a constant velocity. e) Forces are acting on all of the objects in choices a, b, c, and d.
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4.2.3. A child is driving a bumper car at an amusement park. During one interval of the ride, she is traveling at the car’s maximum speed when she crashes into a bumper attached to one of the side walls. During the collision, her glasses fly forward from her face.
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ch04-QZ - Cutnell/Johnson Physics 8th edition Classroom...

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