Learning Path
Question & Answer1
Understand Question2
Review Options3
Learn Explanation4
Explore TopicChoose the Best Answer
A
The frictional force always acts in the opposite direction of the object's motion.
B
The normal force is unaffected by the angle of inclination.
C
The coefficient of friction can change based on the surface material.
D
An object on a steeper incline experiences greater gravitational force components along the incline.
E
Frictional force can be calculated using the formula F_friction = μN, where μ is the coefficient of friction.
Understanding the Answer
Let's break down why this is correct
Answer
The friction force on a sliding block always points opposite to the direction of motion, so it resists the slide down the incline. Its magnitude is given by \(f_k=\mu_k N\), where \(N=mg\cos\theta\) is the normal force; it can never exceed this value. Friction does not depend on the contact area or on how fast the block slides. For example, a 2‑kg block on a 30° plane with \(\mu_k=0. 3\) has \(N=2g\cos30^\circ\) and a kinetic friction of \(0.
Detailed Explanation
The frictional force always moves opposite to how the object slides. Other options are incorrect because Many think the normal push stays the same when you tilt the surface, but it actually gets smaller.
Key Concepts
Friction Forces
Inclined Planes
Normal Force
Topic
Friction Forces Analysis
Difficulty
hard level question
Cognitive Level
understand
Practice Similar Questions
Test your understanding with related questions
1
Question 1Which of the following statements best describes how increasing the normal force affects the frictional force between two surfaces in contact?
easyPhysics
Practice
2
Question 2When an object is sliding down an inclined plane, the force that opposes its motion due to the interaction of the surfaces is known as ___.
hardPhysics
Practice
3
Question 3If an object is sliding down an inclined plane and begins to slow down, what is the underlying cause of this deceleration?
mediumPhysics
Practice
4
Question 4If a block is sliding down an inclined plane, how does the frictional force behave compared to the gravitational force acting parallel to the incline?
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Practice
5
Question 5Which of the following statements about friction are true? (Select all that apply)
easyPhysics
Practice
6
Question 6When analyzing an object on an inclined plane, which factor most directly affects the frictional force acting on it?
easyPhysics
Practice
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