A 3-kg box resting on a horizontal shelf is attached to a 2-kg box by a light
Question:
A 3-kg box resting on a horizontal shelf is attached to a 2-kg box by a light string as in figure.
(a) What is the minimum coefficient of static friction such that the objects remain at rest?
(b) If the coefficient of static friction is less than that found in part (a), and the coefficient of kinetic friction between the box and the shelf is 0.3, find the time for the 2-kg mass to fall 2 m to the floor if the system starts fromrest.
3kg 2kg
Step by Step Answer:
a Draw a freebody diagram for each object In the absence of fricti...View the full answer
Fundamentals of Ethics for Scientists and Engineers
ISBN: 978-0195134889
1st Edition
Authors: Edmund G. Seebauer, Robert L. Barry
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 12.0-kg box resting on a horizontal frictionless surface is attached to 5.00-kg weight by a thin, light wire that passes over a frictionless pulley (Fig. 10.44). The pulley has the shape of a...
-
As shown in Figure 55, what are the four goals under the Employment Act of 1946?
-
A mass m 1 on a horizontal shelf is attached by a thin string that passes over a frictionless peg to a 2.5- kg mass m 2 that hangs over the side of the shelf 1.5 m above the ground (Figure). The...
-
Fun Cosmetics Ltd. is a skincare product manufacturer based in New Zealand that produces the LoveSkin instant moisturizer for women. Because of the reliability and quality of its products, it has...
-
Name one particle that has exactly one quantum unit of charge.
-
Hiroshi Sato, an owner of a sushi restaurant in San Francisco, has been following an aggressive marketing campaign to thwart the effect of rising unemployment rates on business. He used monthly data...
-
Solve Example 7.15 using the maximum strain criterion instead of the maximum stress criterion. See Problem 7.23, for additional information. Problem 7.23 Solve Example 7.15 using the Tsai-Hill...
-
The Converting Department of Forever Fresh Towel and Tissue Company had 840 units in work in process at the beginning of the period, which were 75% complete. During the period, 17,600 units were...
-
One capital investment that State Insurance Company Limited might need to secure financing for in the coming fiscal year is the purchase of a new claims processing system. The estimated cost of the...
-
A highway department is studying the relationship between traffic flow and speed during rush hour on Highway 193. The data in the file TrafficFlow were collected on Highway 193 during 100 recent rush...
-
A 50-kg box that is resting on a level floor must be moved. The coefficient of static friction between the box and the floor is 0.6. One way to move the box is to push down on it at an angle with...
-
Returning to Figure, this t me m 1 = 4 kg. The coefficient of static friction between the block and the incline is 0.4. (a) Find the range of possible values for m 2 for which the system will be in...
-
If only a single force acts on an object, must the object accelerate in an inertial reference frame? Can it ever have zero velocity?
-
The market value of the assets of a corporation is currently $195.0 million, and the firm has on issue a debt outstanding that has a par value of $125.0 million and a due date of exactly four years....
-
To what extent does cultural globalization contribute to a homogenization of cultures, and how can sociological theories account for both the resistance to and adaptation of cultural practices in the...
-
Simplify the following expression completely: (6w) (2w10) (5w) Answer:
-
Vornado took an interest-only mortgage with 60% LTV and 10% interest rate to buy an office building for $10,000,000. The building generates $800,000 of rental income per year and requires a $50,000...
-
S Dwight Furniture makes desks specially designed for small spaces, such as studio apartments and extended-stay hotels. Each desk sells for $110 (without chair). The cost of each desk follows:...
-
Derive the marginal revenue curve when the monopoly faces the linear inverse demand function, in Figure 11.2. How does the slope of the marginal revenue curve compare to the slope of the inverse...
-
Consider model (9.18). What is the effect on the model parameter estimates, their standard errors, and the goodness-of-fit statistics when (a) The times at risk are doubled, but the numbers of deaths...
-
Working individually, draw a pair of coordination compounds that are isomers. Take turns showing your drawings to the groupand have them identify the type of isomerism and the reasons your drawing...
-
In the system shown in Figure P5.31, a horizontal force Fx acts on the 8.00-kg object. The horizontal surface is frictionless. (a) For what values of Fx does the 2.00-kg object accelerate upward? (b)...
-
A frictionless plane is 10.0 m long and inclined at 35.0. A sled starts at the bottom with an initial speed of 5.00 m/s up the incline. When it reaches the point at which it momentarily stops, a...
-
A 72.0-kg man stands on a spring scale in an elevator. Starting from rest, the elevator ascends, attaining its maximum speed of 1.20 m/s in 0.800 s. It travels with this constant speed for the next...
-
Identify one type of business and describe that business and it's lending needs. Then describe what their potential lending needs may? Manufacturing Retail Wholesale Service Construction
-
Many investors believe the slope of yield curve is a leading economic indicator. Do you agree? Why? https://home.treasury.gov/policy-issues/financing-the-government/interest-rate-statistics?
-
Analyze the process for monitoring claims data for detecting potential fraud and abuse and describe how it is a crucial financial management process?
Study smarter with the SolutionInn App