Concept explainers
In three experiments, three different horizontal forces are applied to the same block lying on the same countertop. The force magnitudes are F1 = 12 N, F2 = 8 N, and F3= 4 N. In each experiment, the block remains stationary in spite of the applied force. Rank the forces according to (a) the magnitude fs of the static frictional force on the block from the countertop and (b) the maximum value ƒs, max of that force, greatest first.
Want to see the full answer?
Check out a sample textbook solutionChapter 6 Solutions
Fundamentals of Physics, Volume 1, Chapter 1-20
Additional Science Textbook Solutions
College Physics: A Strategic Approach (3rd Edition)
Physics for Scientists and Engineers, Technology Update (No access codes included)
Physics: Principles with Applications
Conceptual Physics (12th Edition)
Essential University Physics (3rd Edition)
Physics for Scientists and Engineers: A Strategic Approach with Modern Physics (4th Edition)
- A box of bananas weighing 40.0 N rests on a horizontal surface. The coefficient of static friction between the box and the surface is 0.40, and the coefficient of kinetic friction is 0.20. (a) If no horizontal force is applied to the box and the box is at rest, how large is the friction force exerted on it? (b) What is the magnitude of the friction force if a monkey applies a horizontal force of 6.0 N to the box and the box is initially at rest? (c) What minimum horizontal force must the monkey apply to start the box in motion? (d) What minimum horizontal force must the monkey apply to keep the box moving at constant velocity once it has been started? (e) If the monkey applies a horizontal force of 18.0 N, what is the magnitude of the friction force and what is the box’s acceleration?arrow_forwardA 16 kg block of steel is at rest on a horizontal table. The coefficient of static friction between block and table is 0.54. (a) What is the magnitude of the horizontal force that will put the block on the verge of moving? 84.7 N (b) What is the magnitude of a force acting upward 60° from the horizontal that will put the block on the verge of moving? X N (c) If the force acts down at 60° from the horizontal, how large can its magnitude be without causing the block to move? Narrow_forwardThe block shown in the figure is along a frictionless horizontal surface The block's mass is m = 4.70 kg , the magnitude of the applied force is F= 26.5N, and the angle of the applied force from the horizontal is theta = 26.0 degrees. What is the magnitude of the normal force acting on the block.arrow_forward
- Your answer is partially correct. A 2.20 kg block is initially at rest on a horizontal surface. A horizontal force of magnitude 4.22 N and a vertical force are then applied to the block (see the figure). The coefficients of friction for the block and surface are μ = 0.4 and MK = 0.25. Determine the magnitude of the frictional force acting on the block if the magnitude of P is (a) 10.0 N and (b)12.0 N. (The upward pull is insufficient to move the block vertically.) (a) Number i 2.89 (b) Number i Units N Unitsarrow_forwardA block with a mass of 10.09 kg is placed on a ramp. The ramp has an incline of ? = 25.7 degrees from the horizontal. The static coefficient of friction between the block and ramp is μs = 0.211, and the kinetic coefficient of friction between the block and ramp is μk = 0.112. A force, F, is exerted on the block as shown. Note that the force F is parallel with the ramp. What is the smallest value (magnitude) for the force, F, in Newtons that can be exerted on the block to hold the block stationary on the ramp? What is the largest value (magnitude) for the force, F, in Newtons that can be exerted on the block while still holding the block stationary on the ramp? What value (magnitude) for the force, F, is needed to move the block up the ramp at a constant speed?arrow_forwardTwo sheets of plywood A and B lie on the bed of the truck. They have the same weight W, and the coefficient of static friction between the two sheets of wood and between sheet B and the truck bed is µg. (a) If you apply a horizontal force to sheet A and apply no force sheet B to move? What force is necessary to cause sheet A to start to sheet B, can you slide sheet A off the truck without causing moving? (b) If you prevent sheet A from moving by exerting a horizontal force on it, what horizontal force on sheet B is necessary to start it moving? ܥܪ ܩ A B Larrow_forward
- An object with weight W is dragged along a horizontal plan by a force acting along a rope attached to the object. If the rope makes an angle theta with a plane, then the magnitude of the force is: F = (mu)W/((mu)sin(theta)-cos(theta)) where mu is the coefficient of friction. For what theta, F is smallest?arrow_forwardA 2.30 kg block is initially at rest on a horizontal surface. A horizontal force F of magnitude 5.316 N and a vertical force P are then applied to the block (see the figure). The coefficients of friction for the block and surface are us = 0.4 and uk = 0.25. Determine the magnitude of the frictional force acting on the block if the magnitude of P is (a)8.00 N and (b)12.0 N. (The upward pull is insufficient to move the block vertically.) (a) Number Units (b) Number Unitsarrow_forwardA block weighing 67.5 N rests on a plane inclined at 25.0° to the horizontal. A force F is applied to the object at 40.0° to the horizontal, pushing it upward on the plane. The coefficients of static and kinetic friction between the block and the plane are, respectively, 0.380 and 0.156. (a) What is the minimum value of F that will prevent the block from slipping down the plane? (b) What is the minimum value of F that will start the block moving up the plane? (c) What value of F will move the block up the plane with constant velocity?arrow_forward
- A block of weight W=100 is on a rough plane inclined at an angle of 30 degrees with the horizontal. The magnitude of the normal force N1 and the friction F1 when the block is in equilibrium. If the plane was frictionless, find the magnitude of the horizontal force F1, required to keep the block in equilibrium.arrow_forwardA block weighing 60 N is resting on a flat surface where the coefficient of static friction is 0.55, and the coefficient of kinetic friction between them is 0.38. A force F1 = 22 N is applied horizontally to the block in the +x direction. In three experiments, a second force (F2) is applied to the block with these magnitudes and directions: (a) 48 N in −x (b) 62 N in −x and (c) 10 N in +x. In each experiment, what is the magnitude and direction of the frictional force on the block?arrow_forwardA 3.7 kg book is pressed against a wall with a force P at an angle of 35 degrees above the horizontal. The coefficient of static friction between the book and the wall is 0.75. (a)What is the minimum value of the force P that can hold the book to the wall (without it sliding down)? (b)If the force is applied at an angle of 35 degrees below the horizontal, what is the minimum value of the force P that can hold the book to the wall?arrow_forward
- College PhysicsPhysicsISBN:9781305952300Author:Raymond A. Serway, Chris VuillePublisher:Cengage LearningUniversity Physics (14th Edition)PhysicsISBN:9780133969290Author:Hugh D. Young, Roger A. FreedmanPublisher:PEARSONIntroduction To Quantum MechanicsPhysicsISBN:9781107189638Author:Griffiths, David J., Schroeter, Darrell F.Publisher:Cambridge University Press
- Physics for Scientists and EngineersPhysicsISBN:9781337553278Author:Raymond A. Serway, John W. JewettPublisher:Cengage LearningLecture- Tutorials for Introductory AstronomyPhysicsISBN:9780321820464Author:Edward E. Prather, Tim P. Slater, Jeff P. Adams, Gina BrissendenPublisher:Addison-WesleyCollege Physics: A Strategic Approach (4th Editio...PhysicsISBN:9780134609034Author:Randall D. Knight (Professor Emeritus), Brian Jones, Stuart FieldPublisher:PEARSON