Learning Path
Question & Answer1
Understand Question2
Review Options3
Learn Explanation4
Explore TopicChoose the Best Answer
A
The gravitational force acting parallel to the incline becomes weaker as it descends
B
The frictional force acting against the direction of motion increases
C
The normal force increases as the object moves down the slope
D
The object's mass increases as it accelerates down the incline
Understanding the Answer
Let's break down why this is correct
Answer
The object slows because the friction force between it and the slope pushes back against its motion. As the object slides, the normal force from the plane and the coefficient of friction create a frictional force that opposes the component of gravity pulling it down. This frictional force is constant and acts opposite to the direction of motion, so the object’s speed gradually decreases. For example, a 2‑kg block on a 30° incline with a friction coefficient of 0. 3 experiences a friction force of about 5.
Detailed Explanation
The frictional force pushes back against the object's motion, so the block slows down. Other options are incorrect because A common idea is that gravity weakens as the block goes down; Some think the normal force grows as the block moves.
Key Concepts
Friction Forces
Gravitational Forces
Inclined Plane Dynamics
Topic
Friction Forces Analysis
Difficulty
medium level question
Cognitive Level
understand
Practice Similar Questions
Test your understanding with related questions
1
Question 1When an object is sliding down an inclined plane, the force that opposes its motion due to the interaction of the surfaces is known as ___.
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2
Question 2If an object is sliding down an inclined plane and begins to slow down, what is the underlying cause of this deceleration?
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3
Question 3When a ball is thrown upwards, it eventually stops and falls back down. What is the primary cause of the ball's change in motion as it ascends and descends?
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Question 4When a ball is thrown upwards, it eventually stops and falls back down. What is the primary cause of the ball's change in motion as it ascends and descends?
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