Learning Path
Question & Answer1
Understand Question2
Review Options3
Learn Explanation4
Explore TopicChoose the Best Answer
A
It is zero because the object started sliding.
B
It is equal to the weight of the object.
C
It is determined by the ratio of the static friction force to the normal force.
D
It increases as the object's speed increases.
Understanding the Answer
Let's break down why this is correct
Answer
When the object starts to slide, the maximum static‑friction force has been reached, so the applied horizontal force equals μs times the normal force. The normal force is just the weight of the 270‑gram mass, about 2. 65 N. Thus the applied force that made it slide must also be about 2. 65 N, which means μs = F/ N = 2.
Detailed Explanation
Static friction coefficient is the maximum static friction force divided by the normal force. Other options are incorrect because The idea that friction becomes zero once sliding starts is a common mistake; Thinking the coefficient equals the object's weight is another misconception.
Key Concepts
Static Friction Coefficient
Weight and Normal Force
Kinetic Friction
Topic
Friction Forces Analysis (Part 3)
Difficulty
easy level question
Cognitive Level
understand
Practice Similar Questions
Test your understanding with related questions
1
Question 1An object with a mass of 10 kg is resting on a ramp inclined at 30 degrees. If the coefficient of static friction between the object and the ramp is 0.5, what is the maximum static frictional force that can act on the object before it begins to slide down the ramp?
hardPhysics
Practice
2
Question 2If a block weighing 20 kg is placed on a 45-degree incline, and the coefficient of static friction between the block and the incline is 0.6, what is the maximum angle at which the block can remain at rest without sliding down?
mediumPhysics
Practice
3
Question 3In the design of a new roller coaster, engineers must consider the coefficient of friction between the coaster wheels and the tracks. If the coefficient of static friction is 0.6 and the total weight of the roller coaster is 5000 N, what is the maximum force of static friction that can be exerted before the coaster starts to slide?
mediumPhysics
Practice
4
Question 4If a car is moving on a road and the coefficient of static friction between the tires and the surface is 0.7, what does this value indicate about the car's ability to start moving?
easyPhysics
Practice
5
Question 5If the friction coefficient between two surfaces is 0.3, what does this imply about the forces involved?
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Practice
6
Question 6A block is placed on a surface and begins to slide when a force of 270 grams is applied. How would you classify the type of friction acting on the block at this moment?
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Practice
7
Question 7If an object begins to slide down a surface at a weight of 270 grams, what could be the underlying reason for this change in motion in terms of friction forces?
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Practice
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