College Physics
2nd Edition
ISBN: 9780134601823
Author: ETKINA, Eugenia, Planinšič, G. (gorazd), Van Heuvelen, Alan
Publisher: Pearson,
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Textbook Question
Chapter 4, Problem 89GP
* You are hired to devise a method to determine the coefficient of friction between the ground and the soles of a shoe and of its competitors. Explain your experimental technique and provide a physics analysis that could be used by others using this method.
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Chapter 4 Solutions
College Physics
Ch. 4 - Review Question 4.1 When does a vector have a...Ch. 4 - Review Question 4.2 The x- and y-components of...Ch. 4 - Review Question 4.3 What is the force of friction...Ch. 4 - Review Question 4.4 For problems involving objects...Ch. 4 - Review Question 4.5 Why do we need to resolve the...Ch. 4 - Review Question 4.6
You read in this section that...Ch. 4 - 1. A car accelerates along a road. Identify the...Ch. 4 - 2. A person pushes a 10-kg crate exerting a 200-N...Ch. 4 - Compare the ease of pulling a lawn mower and...Ch. 4 - 4. You simultaneously release two balls: one you...
Ch. 4 - You shoot an arrow with a bow. The following is...Ch. 4 - In what reference frame does a projectile launched...Ch. 4 - In Table 4.6 we found that the two balls touched...Ch. 4 - 8. While running at constant velocity, how should...Ch. 4 - 9. You hold a block on a horizontal, frictionless...Ch. 4 - 10. In the process described in the previous...Ch. 4 - Suppose that two blocks are positioned on an...Ch. 4 - 12. A box containing some stones is resting on a...Ch. 4 - For the following two questions, the answer...Ch. 4 - 14. A block is resting on a rough inclined...Ch. 4 -
15. A box with a heavy television set in it...Ch. 4 - 16. How can an Atwood machine be used to determine...Ch. 4 - 17. Your friend is on Rollerblades holding a...Ch. 4 - Explain why a car starts skidding when a driver...Ch. 4 - 19. Explain why old tires need to be replaced.
Ch. 4 - 20. Explain how friction helps you to walk.
Ch. 4 - 21. Explain why you might fall forward when you...Ch. 4 - Explain why you might fall backward when you slip.Ch. 4 - Explain why the tires of your car can spin out...Ch. 4 - You throw two identical balls simultaneously at...Ch. 4 - 25. Your friend says that the vertical force...Ch. 4 - Your friend says that a projectile launched at an...Ch. 4 - An object of mass m1 placed on an inclined plane...Ch. 4 - 28 An object of mass m1 placed on an inclined...Ch. 4 - 29. A horse is pulling a sled. If the force...Ch. 4 - 30. If you kick a block so that it starts moving...Ch. 4 - Determine the x- and y-components of each force...Ch. 4 - 2. Determine the x- and y-components of each force...Ch. 4 - * Determine the x- and y-components of each...Ch. 4 - 4 * The x- and y-components of several unknown...Ch. 4 - * The x- and y-scalar components of several...Ch. 4 - 6. * Three ropes pull on a knot shown in Figure...Ch. 4 - * Figure P4.7 shows an unlabeled force diagram for...Ch. 4 - For each of the following situations, draw the...Ch. 4 - * Write Newtons second law in component form for...Ch. 4 - For the situations described here, construct a...Ch. 4 - * Write Newtons second law in component form for...Ch. 4 - Apply Newtons second law in component form for the...Ch. 4 - Apply Newtons second law in component form for the...Ch. 4 - 14. * Equation Jeopardy 1 The three sets of...Ch. 4 - * You exert a force of 100 N on a rope that pulls...Ch. 4 - 16. * You exert a force of a known magnitude F on...Ch. 4 - * Olympic 100-m dash start At the start of his...Ch. 4 - 18. * Your own accelerometer A train has an...Ch. 4 - * EST Finn and Hazel are using a battery-powered...Ch. 4 - A 91.0-kg refrigerator sits on the floor. The...Ch. 4 - A 60-kg student sitting on a hardwood floor does...Ch. 4 - Car stopping distance and friction A car traveling...Ch. 4 - 23. * A 50-kg box rests on the floor. The...Ch. 4 - 24. * Marsha is pushing down and to the right on a...Ch. 4 - * You want to determine the coefficient of kinetic...Ch. 4 - * A wagon is accelerating to the right. A book is...Ch. 4 - s. Determine an expression for the minimum...Ch. 4 - * A car has a mass of 1520 kg. While traveling at...Ch. 4 - m/s2 when pulled by a rope exerting a 120-N force...Ch. 4 - 30. ** A crate of mass m sitting on a horizontal...Ch. 4 - * EST You absentmindedly leave your book bag on...Ch. 4 - 32. * Block 1 is on a horizontal surface with a...Ch. 4 - 33. * You want to use a rope to pull a 10-kg box...Ch. 4 - 34. * A car with its wheels locked rests on a...Ch. 4 - 35. Olympic skier Olympic skier Tina Maze skis...Ch. 4 - * Another Olympic skier Bode Miller. 80-kg...Ch. 4 - * A book slides off a desk that is tilted 15...Ch. 4 - * Helge, Steve, and Heidi are sitting on a sled on...Ch. 4 - 40. * When traveling on an airplane you get meals...Ch. 4 - 41. Skier A 52-kg skier starts at rest and slides...Ch. 4 - 42. * Ski rope tow You agree to build a backyard...Ch. 4 - 43. * Soapbox racecar A soapbox derby racecar...Ch. 4 - 44. * A person is pushing two carts that are...Ch. 4 - 45. * BIO Whiplash Experience A car sitting at...Ch. 4 - Iditarod race practice The dogs of four-time...Ch. 4 - angle above the horizontal. The other end of the...Ch. 4 - * Rope 1 pulls horizontally, exerting a force of...Ch. 4 - * Three sleds of masses m1,m2,m3 are on a smooth...Ch. 4 - 50. ** Repeat Problem 4.49 , only this time with...Ch. 4 - 51. * A skier is moving down a snowy hill with an...Ch. 4 - ** A person holds a 200-g block that is connected...Ch. 4 - 53. ** Two blocks of masses are connected to each...Ch. 4 - 54. ** The 20-kg block shown in Figure P4.54 ...Ch. 4 - * A squirrel jumps of a roof in the horizontal...Ch. 4 - * A frog jumps at an angle 30 above the...Ch. 4 - 57. A bowling ball rolls off a table. Draw a force...Ch. 4 - 58 * A tennis ball is served from the back line of...Ch. 4 - 59. * Equation Jeopardy 3 The equations below...Ch. 4 - 60 * EST An airplane is delivering food to a small...Ch. 4 - A ball moves in an arc through the air (see Figure...Ch. 4 - A marble is thrown as a projectile at an angle...Ch. 4 - 63 * Marbles are exiting a container through a...Ch. 4 - * Robbie Knievel ride On May 20, 1999, Robbie...Ch. 4 - 65. * Daring Darless wishes to cross the Grand...Ch. 4 - * A football punter wants to kick the ball so that...Ch. 4 - 67. * If you shoot a cannonball from the same...Ch. 4 - 68. When you actually perform the experiment...Ch. 4 - 69. * You can shoot an arrow straight up so that...Ch. 4 - 70. * Robin Hood wishes to split an arrow already...Ch. 4 - 71. * Three force diagrams for a car on a road are...Ch. 4 - * A minivan of mass 1560 kg starts at rest and...Ch. 4 - 74. * Emily pulls a 5-kg block across a rough...Ch. 4 - 75. * EST You abruptly push a 1.7-kg book along a...Ch. 4 - 76 ** EST In the situation of Problem 4.75,...Ch. 4 - 78. * Two blocks of masses and hang at the ends...Ch. 4 - 79. * A 3.5-kg object placed on an Inclined plane...Ch. 4 - above the horizontal) is connected by a string...Ch. 4 - above the horizontal) is connected by a string...Ch. 4 - 82 ** You are driving at a reasonable constant...Ch. 4 - 84. * In the situation of Problem 2.71 (Chapter 2...Ch. 4 - 87. * Your friend has a pie on the roof of his...Ch. 4 - * A ledge on a building is 20 m above the ground....Ch. 4 - 89. * You are hired to devise a method to...Ch. 4 - The mass of a spacecraft is about 480 kg. An...Ch. 4 - incline When she reaches the level floor at the...Ch. 4 - * Tell all A sled starts at the top of the hill...Ch. 4 - Professor tests airplane takeoff speed D. A....Ch. 4 - Professor tests airplane takeoff speed D A Wardle,...Ch. 4 - Professor tests airplane takeoff speed D A Wardle,...Ch. 4 - Professor tests airplane takeoff speed D. A....Ch. 4 - Choose the best velocity-versus-time graph below...Ch. 4 - Ski jumping in Vancouver The 2010 Olympic ski...Ch. 4 - Ski jumping in Vancouver The 2010 Olympic ski...Ch. 4 - Ski jumping in Vancouver The 2010 Olympic ski...Ch. 4 - Assume that the skier left the ramp moving...Ch. 4 - Ski jumping in Vancouver The 2010 Olympic ski...
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- A stockroom worker pushes a box with mass 10.8 kg on a horizontal surface with a constant speed of 3.50 m/s. The coefficients of kinetic and static friction between the box and the surface are 0.220 and 0.530, respectively. For general problem-solving tips and strategies for this topic, you may want to view a Video Tutor Solution of Delivering the goods. Part A What horizontal force must the worker apply to maintain the motion of the box? Express your answer in newtons. Assume that + direction coincides with the direction of velocity. ► View Available Hint(s) F₂ = 23.3 N Submit Previous Answers ✓ Correct Part B If the worker stops pushing, what will be the acceleration of the box? Express your answer in meters per second squared. Assume that +z direction coincides with the direction of velocity. ▾ View Available Hint(s) Hint 1. How to approach the problem In Part A, you would have found an expression for the motion of the box in the horizontal direction using Newton's second law. In…arrow_forwardPart A A stockroom worker pushes a box with mass 14.0 kg on a horizontal surface with a constant speed of 3.10 m/s. The coefficients of kinetic and static friction between the box and the surface are 0.290 and 0.500, respectively. You may want to review (Page). For general problem-solving tips and strategies for this topic, you may want to view a Video Tutor Solution of Delivering the goods. What horizontal force must the worker apply to maintain the motion of the box? Assume + direction coincides with the direction of velocity. ▸ View Available Hint(s) Fx = 39.8 N Submit Previous Answers Part B Correct If the worker stops pushing, what will be the acceleration of the box? Assume + direction coincides with the direction of velocity. View Available Hint(s) Hint 1. How to approach the problem In Part A, you would have found an expression for the motion of the box in the horizontal direction using Newton's second law. In that expression, let the force applied by the worker equal zero and…arrow_forwardWhich of the following is TRUE about the friction force between two surfaces? Mark only one. The surfaces must be in contact with each other in order to have friction. The surfaces must be moving against each other in order to have friction. O The magnitude of the friction force depends on the types of materials present, the force of contact between them, and the surface area of the objects. The magnitude of the friction force increases as the relative speed of the objects increasesarrow_forward
- A force, F (see figure), is applied to a rope so that a large box is being pulled up an inclined plane at a constant velocity. Which statement about the magnitude of the frictional force on the box is true? A There is no friction The friction force equals the applied force The friction force is greater than the applied force Impossible to answer with the given information The friction force is less than the applied force Farrow_forwardA dockworker applies a constant horizontal force of 87.0 N to a block of ice on a smooth horizontal floor. The frictional force is negligible. The block starts from rest and moves a distance 11.5 m in a time of 5.30 s. You may want to review (Page). For general problem-solving tips and strategies for this topic, you may want to view a Video Tutor Solution of Determining force from acceleration. Part A What is the mass of the block of ice? Express your answer in kilograms. ► View Available Hint(s) m = Submit Part B 17 ΑΣΦ x = ? If the worker stops pushing after 5.30 s, how far does the block move in the next 4.80 s? Express your answer in meters. ► View Available Hint(s) — ΑΣΦ kg ? marrow_forwardA crate that has a mass of m = 3.5 kg rests on a horizontal plane. The coefficient of static friction, μs, is 0.25. A horizontal force, F, is applied to the crate, and it is just enough to get the crate to begin moving.a. write an expression for the sum of the forces in the x-direction using that Ff is the static friction force, FN is the normal force and Fg is the weight.b. write an expression for the sum of forces in the y-direction using the same coordinate systemc. calculate the magnitude of F, in newtons, Ff is at its maximumarrow_forward
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- please type answer instead of handwriting, thank youarrow_forwardA student presses a book between his hands, as the drawing indicates. The forces that he exerts on the front and back covers of the book are perpendicular to the book and are horizontal. The book weighs 26.9 N. The coefficient of static friction between his hands and the book is 0.414. To keep the book from falling, what is the magnitude of the minimum pressing force that each hand must exert? Number Unitsarrow_forwardGive reasons for the answers to each of the following questions: (a) Can a normal force be horizontal? (b) Can a normal force be directed vertically downward? (c) Consider a tennis ball in contact with a stationary floor and with nothing else. Can the normal force be different in magnitude from the gravitational force exerted on the ball? (d) Can the force exerted by the floor on the ball be different in magnitude from the force the ball exerts on the floor?arrow_forward
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