03 - fryer (vdf96) Assignment 2 1st and 2nd Law graves (6)...

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Unformatted text preview: fryer (vdf96) Assignment 2 1st and 2nd Law graves (6) 1 This print-out should have 33 questions. Multiple-choice questions may continue on the next column or page find all choices before answering. 001 10.0 points A heavily loaded freight train moves with constant velocity. What is the relationship between the net force on the first car ( F 1 ) and the net force on the last car ( F 2 )? 1. F 1 = F 2 correct 2. Unable to determine. 3. F 1 > F 2 4. F 1 < F 2 Explanation: The net force on each car is zero because the train moves with constant velocity (no acceleration). 002 10.0 points A female gymnast weighs 500 N. If she is hanging stationary from a high bar, how many forces are acting on her? 1. four 2. one 3. two correct 4. three 5. five Explanation: Two forces act on her: gravity pulls down on her and the bar pulls up on her. These forces are equal (500 N), but act in opposite directions. 003 10.0 points An elevator is being lifted up an elevator shaft at a constant speed by a steel cable as shown in the figure below. All frictional effects are negligible. steel cable Elevator going up at constant speed In this situation, forces on the elevator are such that 1. the upward force by the cable is greater than the downward force of gravity. 2. None of these. (The elevator goes up because the cable is being shortened, not be- cause an upward force is exerted on the eleva- tor by the cable.) 3. the upward force by the cable is smaller than the downward force of gravity. 4. the upward force by the cable is greater than the sum of the downward force of gravity and a downward force due to the air. 5. the upward force by the cable is equal to the downward force of gravity. correct Explanation: Since the elevator is being lifted at a con- stant speed, the net force on it is zero, there- fore, the upward force by the cable is equal to the downward force of gravity. 004 10.0 points A toy car is given a quick push so that it moves up an inclined ramp. After it is released, it moves up, reaches its highest point and moves back down again. Friction is so small it can be ignored. fryer (vdf96) Assignment 2 1st and 2nd Law graves (6) 2 What net force acts on the car? 1. Net force of zero 2. Net increasing force up the ramp 3. Net constant force down the ramp cor- rect 4. Net decreasing force up the ramp 5. Net decreasing force down the ramp 6. Net increasing force down the ramp 7. Net constant force up the ramp Explanation: The net force is the component of gravity along the incline; it is constant and acts down the ramp. 005 (part 1 of 2) 10.0 points Sue and Jenny kick a soccer ball at exactly the same time. Sues foot exerts a force of 61 N to the north. Jennys foot exerts a force of 116 . 3 N to the east....
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This note was uploaded on 12/11/2011 for the course PHYSICS 101 taught by Professor Graves during the Fall '10 term at San Jose City College.

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03 - fryer (vdf96) Assignment 2 1st and 2nd Law graves (6)...

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