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- A man exerts a force of 16.7 N horizontally on a box so that it is at rest in contact with a wall as in Figure 6.3. The box weighs 6.52 N. a. Find the static friction force exerted on the box, given the forces being applied, b. If the coefficient of static friction between the wall and the box is 0.50, find the maximum static friction force that may be exerted on the box. Comment on your results.A small steel I-beam (Fig. P6.14) is at rest with respect to the steel surface of a truck. The truck is accelerating with respect to the road. The mass of the I-beam is 5.8 103 kg. a. Draw a free-body diagram for the I-beam. b. What force or forces accelerate the I-beam with respect to the ground? c. The I-beam must remain at rest with respect to the truck. What is the maximum acceleration of the truck? Evaluate your answer. d. On the highway, the truck moves with a constant velocity. Draw a free-body diagram for the I-beam. Compare it with your diagram in part (a). FIGURE P6.14In Figure P1.84, the pulleys and the cord are light, all surfaces are frictionless, and the cord does not stretch. (a) How does the acceleration of block 1 compare with the acceleration of block 2? Explain your reasoning. (b) The mass of block 2 is m2 = 1.30 kg. Derive an expression for the acceleration of the block having mass m2 as a function of the mass of block 1, m1. (c) What does the result of part (b) predict if m1 is very much less than 1.30 kg? (d) What does the result of part (b) predict if m1 approaches infinity? (e) In this last case, what is the tension in the cord? (f) Could you anticipate the answers to parts (c), (d), and (e) without first doing part (b)? Explain. Figure P1.84
- Chris, a recent physics major, wanted to design and carry out an experiment to show that an objects mass determines its inertia. He used an ultrasound device to measure acceleration of a low-friction cart attached to a hanging block to provide the same force on the cart during each run (Fig. P6.76A). Chris varied the mass of the cart by varying the number of lead rods placed in it. Chris used Newtons second law Fx=FT=Max to predict his results. He reasoned that because FT is the same for each run, the carts acceleration should be inversely proportional to its mass: ax=FTM=constantM(1) Chriss goal was to show that his data fit Equation (1). He decided to analyze his results by plotting ax as a function of 1/M; Equation (1) predicted that he should get a straight line, passing through the origin with a slope equal to the tension (red line in Fig. P6.76B): Chris ran several trials for each run, averaged his results and estimated the error. He then plotted his data (green line in Fig. P6.76B). Chris was excited to see that he correctly predicted that the data fell along a straight line: ax=(0.27N)1M(0.048m/s2) According to the straight-line fit to the data, the slope of the line is 0.27 N, which was close to the weight of the hanging mass and therefore close to the tension in the string. Chris, though, was disappointed to see that the line had a negative intercept. Mathematically, as M, 1M0. Chris was confused because he believed that as the mass increased, the carts acceleration should approach zero. He was quite sure that he did not discover some new property of inertia or mass. After convincing himself that he was not being careless in the laboratory and that his data were correct, he started to search for an explanation for the discrepancy between his prediction and his data. Help Chris find an explanation. FIGURE P6.76 A. Chriss experimental apparatus. B. Chriss prediction (red line) and experimental results (green line).Which statement describes the effect of an inclined plane on the amount of force required to push an object? A. Objects require more force to push them up an inclined plane compared to a flat surfaceB. There is no way to predict the effect of an inclinded plane on the amount of force required to push an objectC. Objects require less force to push them up an inclined plane compared to a horizontal surface.D. Objects require the same amount of force to push them up an inclined plane as on a flat surfaceWhich of the following statements about friction is not true? * A. An object of large mass is pulled down onto a surface with a greater force than an object of low mass and, as a consequence, experiences a greater friction B. The direction of friction is always opposite to the direction of motion C. Friction is a force D. The direction of friction is always the same as the direction of motion
- A man stands on a spring scale in a moving elevator and notices that the scale reading is 20% larger than when he weighs himself in his bathroom. Which statement cannot be true? a. The elevator could be moving upward at constant speed. b. The elevator could be moving upward with increasing speed. c. The elevator could be moving downward with decreasing speed. d. The tension in the supporting cable must exceed the weight of the elevator and its contents.1. Steve pushes a box across a level floor with a constant horizontal force. This causes the box to move at a constant speed, v. The force from Steve: a. has the same magnitude as the weight of the box. b. equals the sum of the box's weight and the total frictional forces opposing the box's motion. c. has the same magnitude as the frictional forces opposing the box's motion. d. has greater magnitude than the frictional forces opposing the box's motion. e. has greater magnitude than the weight of the box. 2. Steve now doubles the force he applies to th box from the previous problem. Which of the following is true? a. The box will move at double the previous speed. b. The box will move with a continuously increasing speed. c. The box will increase speed for a while, then move at a constant speed. d. The box will continue to move at the same speed for a while, then continually increase speed. e. The box will move at a greater constant speed, but not necessarily double the speed.PRINTER VERSION 1 BACK Chapter 07, Problem 007 Your answer is partially correct. Try again. A 4.6 kg body is at rest on a frictionless horizontal air track when a constant horizontal force F acting in the positive direction of an x axis along the track is applied to the body. A stroboscopic graph of the position of the body as it slides to the right is shown in the figure. The force F is applied to the body at t = 0, and the graph records the position of the body at 0.50 s intervals. How much work is done on the body by the applied force F between t = 0 and t = 1.8 s? rt%3D0 0.5 s -1.0s 1.5 s 2.0 s- LIT 0.2 0.4 0.6 0.8 x (m) Number To.8 Units the tolerance is +/-2% Click if you would like to Show Work for this question: Open Show Work SHOW HINT LINK TO TEXT LINK TO SAMPLE PROBLEM VIDEO MINI-LECTURE search 9:06 PM ENG 4/4/2021 SUS pgup pgdn 17 end prt sc pause insert delete break %23 3 5. 6. backspac
- The amount of friction between two objects will depend on which of the following? * a. The weight of the object and the surface materials of the object b. Only the weight of the object c. Only the surface materials of the object d. The volume of the objectReview I Constants What are the coefficient of static and kinetic friction between the crate and the floor? A 45.0 kg crate of tools rests on a horizontal floor. You exert a gradually increasing horizontal push on it, and the crate just begins to move when your force exceeds 313 N. Then you must reduce your push to 208 N. to keep it moving at a steady 25.0 cm/s. Enter your answers numerically separated by a comma. Ha. = Submit Previous Answers Request Answer Part B What push must you exert to give it an acceleration of 1.10 m/s?? Express your answer with the appropriate units. HA ? Value Units F = P Pearson Copyright © 2022 Pearson Education Inc. All rights reserved. Terms of Use | Privacy Policy I Permissions I Contact Us | étv 27 MacBook Air DII DD 80 F8 F9 F7 F6 F5 F3 F2 * 23 $ % & 7 8 9 3 4 { [ E R Y G H J C V M 9-2 .. .- . V B* Co Two cubes are placed in contact on a surface, one of mass 2M and the other of mass 3M as shown in the figure, where M = 1.0 kg. The coefficient of kinetic friction between the surface and each block is 0.25. An external force, F = 22 N, is applied horizontally as shown. If the cubes start from rest, how long does it take for them to cover a distance of 5.0 m? 3M. 2.3 s 1.7 s 4.4 s 1.4 s 13 A ctv MacBook Air F5 F8 F11 F12 OLI % 5 V 7. 6 Y