Concept explainers
* You want to determine the coefficient of kinetic friction between a
(which has a surface area 100 times smaller than the entire rug), a scale for measuring mass, a force meter, and an object of mass
a. Put the object on the piece of rug. Measure the force
b. Use the same method described in (a) but calculate the coefficient of friction as
c. Use the same method described in (a) but also measure the mass of the rug piece
d. Use the same method described in (c) but calculate the coefficient of friction as
Want to see the full answer?
Check out a sample textbook solutionChapter 4 Solutions
College Physics
Additional Science Textbook Solutions
Essential University Physics: Volume 1 (3rd Edition)
Modern Physics
Conceptual Physics (12th Edition)
College Physics: A Strategic Approach (4th Edition)
University Physics (14th Edition)
Conceptual Physical Science (6th Edition)
- CASE STUDY In the train collision case study (Chapter 5, page 119), we ignored the drag force on the trains. Estimate the drag on the trains and compare it to the kinetic friction on them. Is it okay to ignore drag? Explain.arrow_forwardA sled and rider have a total mass of 56.8 kg. They are on a snowy hill. The coefficient of kinetic friction between the sled and the snow is 0.195. The angle of the hills slope measured upward from the horizontal is 19.5. What is the acceleration of the rider? Is the acceleration greater, less than, or equal to your result if a more massive rider uses the same sled on the same hill? Explain.arrow_forwardThe shower curtain rod in Figure P6.7 is called a tension rod. The rod is not attached to the wall with screws, nails, or glue, but is pressed into the wall instead. Explain why the rod remains at rest, supporting the curtain. Explain why the name is misleading and come up with a better name. FIGURE P6.7arrow_forward
- (a) How far from the center of Earth would the net gravitational force of Earth and the Moon on an object be zero? (b) Setting the magnitudes of the forces equal should result in two answers from the quadratic. Do you understand why there are two positions, but only one where the net force is zero?arrow_forwardA cart and rider have a total mass of 56.8 kg. The cart is rolling down a hill and accelerating at 0.5g. The coefficients of kinetic friction and of rolling friction between the carts wheels and the road are 0.20 and 0.020 respectively. What is the angle of the hills slope measured upward from the horizontal? You may find a spreadsheet program helpful in answering this question.arrow_forwardStarting from rest, a rectangular toy block with mass 300 g slides in 1.30 s all the way across a table 1.20 m in length that Zak has tilted at an angle of 42.0 to the horizontal. a. What is the magnitude of the acceleration of the toy block? b. What is the coefficient of kinetic friction between the block and the table? c. What are the magnitude and direction of the friction force acting on the block? d. What is the speed of the block when it is at the end of the table, having slid a distance of 1.20 m?arrow_forward
- Give 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_forwardReturn to Example 9.9 and use the result to find the tension in the rope. Example 9.9 Snow Tubing At a winter recreation resort, snow tubers at the bottom of the hill hook their tubes to a tow rope. A motor pulls the rope so that tubers move at constant velocity to the top of the hill. (Ignore the momentary acceleration of the tuber when he first attaches his tube to the rope.) The coefficient of kinetic friction between the tube and the snow is k = 0.16. A boy and his tube with a total weight of 415 N are pulled a distance of 255 m up the 18 incline (Fig. 9.29). Consider the Earth, the boy, his tube, and the snow along his path to make up the system. Find the energy transferred from the motor to the system via the work done by the rope. FIGURE 9.29arrow_forwardYou blow a small piece of paper through the air. Is the force on the paper a contact force or a field force? Explain.arrow_forward
- A filled treasure chest of mass m with a long rope tied around its center lies in the middle of a room. Dirk wishes to drag the chest, but there is friction between the chest and the floor with a coefficient of static friction s. If the angle between the rope and the floor is , what is the magnitude of the tension required to just get the chest moving? Express your answer in terms of m, s, , and g.arrow_forwardA block lies motionless on a horizontal tabletop. You apply a force Fapp horizontally to the block, but it does not move. What can you say about the relative sizes and magnitudes of Fapp, the static friction force between the block and the table, and the kinetic friction force between the block and the table?arrow_forwardA textbook rests on a movable wooden plank that is initially parallel to the ground. a. How does the normal force on the book compare to the gravitational force on the book as it rests in the horizontal position? b. If you push down on the book, what happens to the magnitude of the normal force as it rests in the horizontal position? c. The normal force on the book is part of a third-law interaction pair. Describe the third-law partner of this normal force.arrow_forward
- Physics for Scientists and Engineers: Foundations...PhysicsISBN:9781133939146Author:Katz, Debora M.Publisher:Cengage LearningPrinciples of Physics: A Calculus-Based TextPhysicsISBN:9781133104261Author:Raymond A. Serway, John W. JewettPublisher:Cengage LearningUniversity Physics Volume 1PhysicsISBN:9781938168277Author:William Moebs, Samuel J. Ling, Jeff SannyPublisher:OpenStax - Rice University