Consider the system shown in Fig. 5.54. Block A weighs 45.0 N and block B weighs 25.0
Question:
(a) Calculate the coefficient of kinetic friction between block A and the tabletop.
(b) A cat, also of weight 45.0 N, falls asleep on top of block A. If block B is now set into downward motion, what is its acceleration (magnitude and direction)?
210 310
Step by Step Answer:
IDENTIFY Constant speed means zero acceleration for each block If the block is moving the friction f...View the full answer
University Physics with Modern Physics
ISBN: 978-0321696861
13th edition
Authors: Hugh D. Young, Roger A. Freedman, A. Lewis Ford
Related Video
Static friction and kinetic friction are two types of friction that occur when two objects are in contact with each other. Static friction is the force that must be overcome to initiate motion between two surfaces that are in contact with each other but are not moving relative to each other. It is caused by the interlocking of rough surfaces at the microscopic level, and it increases as the force pushing the surfaces together increases. Once motion between the surfaces starts, the static friction is no longer present. Kinetic friction, also known as sliding friction, is the force that opposes the motion of two surfaces that are in contact with each other and are moving relative to each other. It is caused by the rubbing of the surfaces against each other and the resistance of the molecules in the surfaces to being moved. Kinetic friction is generally less than static friction, but it can still be a significant force, especially at high speeds. Both static and kinetic friction can be quantified using a coefficient of friction, which is a dimensionless number that represents the ratio of the frictional force between two surfaces to the normal force (the force perpendicular to the surfaces). The coefficient of static friction is typically greater than the coefficient of kinetic friction for a given pair of surfaces, because it takes more force to overcome the interlocking of the surfaces at rest than to maintain motion once it has started.
Students also viewed these Mechanics questions
-
Consider the system shown in Fig. P5.127. Tank A has a volume of 100 L and contains saturated vapor R-134a at 30C. When the valve is cracked open, R-134a flows slowly into cylinder B The piston mass...
-
Consider the system shown in Fig. P177, if a change of 0.7 kPa in the pressure of air causes the brinemercury interface in the right column to drop by 5 mm in the brine level in the right column...
-
Consider the system shown in Fig. 6.37. The rope and pulley have negligible mass, and the pulley is frictionless. The coefficient of kinetic friction between the 8.00-kg block and the table-top is...
-
Which one of the following is NOT an example of cash flows in operating activities according to direct method? Select one: a. Cash payment for purchase of inventories b. Cash received from debtors c....
-
Solve the system graphically. 1. 2. 3. 4. [2 %3D = 10 + 5 %3D 6 -6 J &x %3D 3 |2r + 5y = 28
-
An almost spherical surface defined by R() = R0[1 + P2(cos )] has inside of it a uniform volume distribution of charge totaling Q. The small parameter varies harmonically in time at frequency . This...
-
State the appropriate null and alternate hypotheses for determining whether to conclude that the failure rates differ among the four lines. Exercises 49 refer to the following data: Electric motors...
-
Complete the following chart by indicating whether each item is true or false. Explain your answers by referencing the overlap of rules appearing in Federal and most state income tax laws. True or...
-
Sales (4,000 pools) Variable expenses: Variable cost of goods sold* Variable selling expenses Total variable expenses Contribution margin Fixed expenses: Manufacturing overhead Selling and...
-
The Archives of Pediatrics and Adolescent Medicine (Dec. 2007) conducted a study of 105 ill children to determine if honey was a remedy for coughing. The children were randomly divided into groups....
-
Coefficient of Friction A clean brass washer slides along a horizontal clean steel surface until it stops. Using the values from Table 5.1, how many times farther would it slide with the same initial...
-
Two crates collected by a rope lie on a horizontal surface (Fig. 5.55). Crate A bas mass mA and crate B bas mass mB' the coefficient of kinetic friction between each crate and the surface is μt....
-
Scandals involving large U.S. corporations (e.g.. Enron. WorldCom, and Adelphia) have had a major impact on the public's attitude toward business managers. In a Harris Poll administered immediately...
-
Let C be the line segment from the point (-4,8) to the point (2,-4), C be the arc on the parabola y = x -8 from the point (-4,8) to the point (2,-4), and R be the region enclosed by C and C. Consider...
-
Choose a domestic industry and domestic company (preferably the company you work for as you know the firm better) and then scope and develop a meaningful set of scenarios discussing the use of IT...
-
Explain the impact of price elasticity on price determination in the traditional market?
-
The Belfood Malaysia manufactures 1 2 0 0 0 units. Belfood Malaysia sold 1 0 0 0 units. The Company has fixed manufacturing overhead of RM 2 , 0 0 0 . Direct materials cost is RM 5 per unit, direct...
-
A non-conductive sphere of radius R has a uniform volume charge density, p C/m. Derive an expression for the electric flux density D at a distance, r, from the centre of the sphere: for, r < R, and r...
-
For an appropriate segregation of duties, journalizing and posting sum- mary payroll transactions should be assigned to a. The treasurer's department. b. General accounting. c. Payroll accounting. d....
-
The area of square PQRS is 100 ft2, and A, B, C, and D are the midpoints of the sides. Find the area of square ABCD. B A
-
Evaluate lim x-0 sin(3 + x) - sin 9 X
-
Evaluate economic conditions that influence company performance of starbucks Consider political, environmental, currency ( money ) , global economics, and government influences on economic...
-
(Part 1) : The business letter to your employer. The purpose of the letter is to explain why diversity is important in the workplace and to recommend actions the organization can take to become more...
-
Question 4 (20 marks)In the recent annual general meeting of Umi Technology Limited, the board of directors declared an annual dividend of $5.00 per share, and the shareholders agreed to a rights...
Study smarter with the SolutionInn App