Learning Path
Question & Answer1
Understand Question2
Review Options3
Learn Explanation4
Explore TopicChoose the Best Answer
A
Surface texture
B
Motion velocity
C
Acceleration
D
Object shape
Understanding the Answer
Let's break down why this is correct
Answer
Static friction is the force that keeps an object at rest, and it is proportional to the normal force, which for a horizontal surface is just the weight of the object. Kinetic friction is the force that opposes motion once the object starts sliding, and it is also proportional to the same normal force. Therefore, the relationship that holds for static friction with weight also holds for kinetic friction with weight. For example, if a 2‑kg block on a horizontal table has a weight of 20 N, the maximum static friction might be 10 N and the kinetic friction could be 8 N, both proportional to the 20 N weight. Thus the answer is “weight.
Detailed Explanation
Kinetic friction is mainly set by how rough the two surfaces are. Other options are incorrect because Speed of sliding does not decide how much kinetic friction exists; Acceleration is not a cause of friction; it is the result of forces, including friction, acting on a body.
Key Concepts
Friction Forces
Surface Interaction
Motion Dynamics
Topic
Friction Forces Analysis (Part 3)
Difficulty
medium level question
Cognitive Level
understand
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