A box full of books rests on a wooden floor. The normal force the floor exerts on
Question:
(a) You push horizontally on the box with a force of 120 N, but it refuses to budge. What can you say about the coefficient of static friction between the box and the floor?
(b) If you must push horizontally on the box with a force of at least 150 N to start it sliding, what is the coefficient of static friction?
(c) Once the box is sliding, you only have to push with a force of 120 N to keep it sliding.
What is the coefficient of kinetic friction?
Step by Step Answer:
a The force of static friction is greater than the applied force Draw a diagram Fin...View the full answer
Physics
ISBN: 978-0077339685
2nd edition
Authors: Alan Giambattista, Betty Richardson, Robert Richardson
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
-
A crate of books rests on a level floor. To move it along the floor at a constant velocity, why do you exert less force if you pull it at an angle u above the horizontal than if you push it at the...
-
A 25.O-kg box of textbooks rests on a loading ramp that makes an angle a with the horizontal. The coefficient of kinetic friction is 0.25, and the coefficient of static friction is 0.35. (a) As the...
-
A backpack full of books weighing 52.0 N rests on a table in a physics laboratory classroom. A spring with a force constant of 150 N/m is attached to the backpack and pulled horizontally, as...
-
Use the following table, Present Value of an Annuity of 1 Period 8% 9% 10% 1 0.926 0.917 0.909 2 1.783 1.759 1.736 3 2.577 2.531 2.487 A company has a minimum required rate of return of 9 %. It is...
-
Answer these questions about receivables and uncollectibles. For the true-false questions, explain any answers that turn out to be false. 1. True or false? Credit sales increase receivables....
-
Dudley Bank has the following balance sheet and income statement. For Dudley Bank, calculate: a. Return on equity b. Return on assets c. Asset utilization d. Equity multiplier e. Profit margin f....
-
Use the data in the first table of Global Insights 6.1 to calculate U.S. tariff revenues on costume jewelry, glass and glassware, and rubber footwear. Global Insights 6.1 The Welfare Costs of...
-
The Roniger Company produces two products: bed mattresses and box springs. A prior contract requires that the firm produce at least 30 mattresses or box springs, in any combination. In addition,...
-
How do advanced separation techniques, such as membrane-based extraction and liquid membrane extraction, overcome limitations of traditional extraction methods, and what are their respective...
-
Kijiji Auctions runs an online auction company. Its end-of-year financial statements indicate the following results. Calculate the companys net profit margin expressed as a percent (to one decimal...
-
A 10.0-kg block is released from rest on a frictionless track inclined at an angle of 55. (a) What is the net force on the block after it is released? (b) What is the acceleration of the block? (c)...
-
A helicopter is lifting two crates simultaneously. One crate with a mass of 200 kg is attached to the helicopter by a cable. The second crate with a mass of 100 kg is hanging below the first crate...
-
Based on the facts and results of Problems 41-47, provide the income tax footnote rate reconciliation for Kantner.
-
1. Consider the following I type instruction: op rs rt constant or address Where the opcode = addi, rs = $s2 and rt=$s1. The value of register $s2 is 01001010, and the constant value is = 11101110....
-
Answer this question about WOW.ax (Woolworths Group Aus) Societal Constraints 1) How the firm addresses the issue of Corporate Social Responsibility? 2) Does the firm have a particularly good or...
-
Define a relation R on Z as follows: m, n Z, m Rn 5 (m - n). Which one of the following choices is not true? (-8) R 11 01R (-9) 2 R 13 5 R 5
-
What is the process of de ning more than one method in a class di erentiated by method signature? Group of answer choices Method Overloading Method Overwriting Method Overlapping Method Overriding
-
The hash function h(k)= k mod m and linear probing are used to insert the keys 37, 38, 72, 48, 98, 11, 56 into a hash table of size = 7 having indices 0...6. The order of the hash codes in the array...
-
Snow Cap Company has a unit selling price of $250, unit variable costs of $170, and fixed costs of $160,000. Compute the break-even point in sales units using (a) The mathematical equation (b) Unit...
-
Write a paper detailing a geographic information system (GIS) of your own design that would utilize data in an original manner.
-
These two waves travel along the same string: y1(x, t) = (4.60 mm) sin (2x 400t) y2(x, t) = (5.60 mm) sin (2x 400t + 0.80 rad). What are? (a) The amplitude and (b) The phase angle (relative to wave...
-
A 125 cm length of string has mass 2.00 g and tension 7.00 N. (a) What is the wave speed for this string? (b) What is the lowest resonant frequency of this string?
-
What are? (a) The lowest frequency, (b) The second lowest and (c) The third lowest frequency for standing waves on a wire that is 10.0m long, has a mass of 100g, and is stretched under a tension of...
-
1. Mention five key organizational characteristics that the Cll research team identified for organizations with effective quality management systems. provide brief discussion of each and how it...
-
When a metal was exposed to photons at a frequency of 1.46 1015 s1, electrons were emitted with a maximum kinetic energy 3.60 10-19 J. G ? Calculate the work function, , of this metal. J/photon What...
-
No. 101 Debit Cash $ 2,400 Question 2 (10 pts) On November 1, 2024, the account balances of Schilling Equipment Repair were as follows. Accumulated Depreciation-Equipment A Clipboard Font Alignment...
Study smarter with the SolutionInn App