Concept explainers
Section 4.6 Free-Body Diagrams
4.25 Crates A and B sit at rest side by side on a frictionless horizontal surface. They have masses mA and mB, respectively. When a horizontal force
Learn your wayIncludes step-by-step video
Chapter 4 Solutions
University Physics with Modern Physics (14th Edition)
Additional Science Textbook Solutions
University Physics Volume 2
Life in the Universe (4th Edition)
Physics for Scientists and Engineers: A Strategic Approach with Modern Physics (4th Edition)
Conceptual Physics (12th Edition)
College Physics
Essential University Physics: Volume 2 (3rd Edition)
- 5.0 kg) on a tilted wooden board with an angle of 0 = 30 There is a metal block (m from the horizontal. The block is initially at rest. The coefficient of static friction u, is equal to 0.55 and the coefficient of kinetic friction ux is 0.40. a) Draw a free body diagram of the metal block on the figure. Label and write all the forces in unit-vector notation with their magnitude (in variables) on the diagram below. b) Note that F, = 0, because the block can only move %3D along the board. Calculate the normal force. c) Will the block slide down? Show your calculations to support your answer. d) If your answer is "yes" in (c), then what is the acceleration of the block? (Note that F: If your answer is "no" in (c), then what is the static friction on the block? та.) %3Darrow_forwardProblem 5: An object of mass m has these three forces acting on it (there is no normal force, "no surface"). F = 3 N, F2 = 10 N, and F3 = 5 N. When answering the questions below, assume the x-direction is to the right, and they-direction is straight upwards. F, F What is the net force in component form, in terms of F1, F2, F3, and the unit vectors i and j F = 7 8 HOME a F| i j 4 5 y d. F1 1 | 2 3 F2 F3 +| - END h P vol BACKSPACE DEL CLEAR Submit Hint Feedback I give up! What is the magnitude of the net force, in newtons? What is the angle e, in degrees, of the net force, measured from the +x-axis? Enter an angle between -180° and 180°. What is the magnitude, Ja of the acceleration, in meters per square second, if the block has a mass of 8.9 kg?arrow_forwardBlock A is on top of block B connected by a light, flexible cord passing around a fixed, frictionless pulley. All other surfaces have friction. (a.) Draw the FBD of Block A. Label action-reaction pairs with only one label. (b.) Draw the FBD of Block B. Label action-reaction pairs with only one label. (c.) Block A weighs 1.90 N, and Block B weighs 4.20 N. The coefficient of kinetic friction between all surfaces is 0.30. Find the magnitude of the horizontal force F necessary to drag block B to the left at constant speed if A and B are connected by a light, flexible cord passing around a fixed, frictionless pulley.arrow_forward
- Two blocks of equal masses are placed on a horizontal table as shown. The bottom block is then pulled with a slowly increasing horizontal force F. Both contact surfaces (between the bottom block and the table and between the two blocks) are frictionless. Select the correct description of the motion of the blocks. Note: "move" or "does not move" refers to the laboratory ("Earth") frame of reference.. Both blocks begin to move simultaneously as soon as force F is applied. The top block begins to move as soon as force F is applied; the bottom block does not move at all. The bottom block begins to move as soon as force F is applied; the top block does not move at all. Both blocks begin to move simultaneously as soon as force F reaches a certain minimum value. The top block begins to move as soon as force F reaches a certain minimum value; the bottom block does not move at all. The bottom block begins to move as soon as force F reaches a certain minimum value; the top block does not move at…arrow_forwardDuring a time interval of one second, a ball moves in the +x or -x direction (that is, to the right or the left), and a net force acts on the ball in the +x or -x direction. For each motion listed below, check all the descriptions of net force that could produce that behavior. More than one description may be valid for a particular motion.arrow_forwardThree blocks A, B, and C stand next to each other as shown in the figure. A force F with magnitude 140.5 N is applied to push block C directly and sends the blocks accelerating to the right. Let's assume there is no friction between the blocks and the ground. The mass of A, B, and C are 7.7, 58.7, and 99.7 kg, respectively. What is the force applied on block B by block C F (in unit of N)? B Aarrow_forward
- Which of the following is incorrect regarding Newton's Third Law of Motion? O A force acting on a body is always the results of its interaction with another body. Whenever two bodies interact, the two forces that they exert on each other are always equal in magnitude and direction. Forces always comes in pairs, that is for every action, there an equal but opposite reaction. The force exerted by a on bis equal to (-)force exerted by b on aarrow_forwardTwo blocks of masses m and m2 (m1 > m2) are placed on a frictionless table in contact with each other. A horizontal force of magnitude F is applied to the block of mass m, in the figure below. F (a) If P is the magnitude of the contact force between the blocks, draw the free-body diagrams for each block. (Do this on paper. Your instructor may ask you to turn in this work.) (b) What is the net force on the system on the system consisting of both blocks? (Use the following as necessary: P and F.) Fnet (c) What is the net force acting on m1? (Use the following as necessary: P and F.) Fnet,1 = (d) What is the net force acting on m2? (Use the following as necessary: P and F.) Fnet,2 = (e) Write the x-component of Newton's second law for each block. (Do this on paper. Your instructor may ask you to turn in this work.) (f) Solve the resulting system of two equations and two unknowns, expressing the acceleration a and contact force P in terms of the masses and force. (Use the following as…arrow_forwardA 2-kg hanging mass (m,) is connected by a string over a pulley to a 20-kg block (m2) that is sliding on a 50° fixed inclined plane (see the figure below). If the pulley's mass and the mass of the string are negligible, and all surfaces are frictionless, the magnitude of the acceleration (in m/s2) of the moving system is: A. 7.14 a. B. 9.8 C. 5.93 D. 3.56 E. 0.48 a.arrow_forward
- Problem #1: (a) Draw the free body diagrams for the two blocks pictured below. There is friction on the ramp. 40° (b) Draw free body diagrams for the two situations involving a block of ice being pulled and pushed with an equal force and angle. 25° 25° (c) Is the normal force up on the block of ice from the floor equal in the two situations in (b)? If they are equal, explain why. If they are not, explain why and state which is larger.arrow_forwardIn the figure, a horizontal force of 100 N is to be applied to a 10 kg slab that is initially stationary on a frictionless floor, to accelerate the slab. Block Slab 100 N A 10 kg block lies on top of the slab; the coefficient of friction u between the block and the slab is not known, and the block might slip. Considering that possibility, what is the possible range of values for the magnitude of the slab's acceleration aslab? (Hint: You don't need written calculations; just consider extreme values for u .) Block Slab 100 N Number Units to Number Units What is the possible range for the magnitude ablock of the block's acceleration? Block Slab 100 N Number Units Number Unitsarrow_forward1) You pull horizontally on the block in the figure, causing both blocks to move together as a unit. For this moving system: (a) make carefully labeled free-body diagrams of the blocks assuming there is friction HA between the two blocks and µg between the block and the table. (b) Write out Newton's equations of motion for both block separating out the x and y components. (c). The table is frictionless but there is friction (a horizontal force) between blocks A and B. Block B has mass 6.00 kg and block B has mass 2.00 kg. If the horizontal pull applied to block B equals 12.0 N. then block B has an acceleration of 1.80 m/s². What is the acceleration of block A?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