Learning Path
Question & Answer1
Understand Question2
Review Options3
Learn Explanation4
Explore TopicChoose the Best Answer
A
An increase in the normal force directly increases the frictional force.
B
An increase in the normal force has no effect on the frictional force.
C
An increase in the normal force decreases the frictional force.
D
An increase in the normal force only affects the static friction coefficient.
Understanding the Answer
Let's break down why this is correct
Answer
The frictional force grows when the normal force is raised, because the two surfaces press harder together. The contact area stays the same, but the molecules at the interface are pushed tighter, so more resistance is generated. In the simple model of kinetic friction, the friction force equals the coefficient of kinetic friction times the normal force, so it scales directly with that force. For example, if a box weighing 20 N slides on a rough floor with a kinetic friction coefficient of 0. 3, the friction force is 0.
Detailed Explanation
The normal force is the push that keeps the two surfaces pressed together. Other options are incorrect because Some think a heavier load doesn’t change friction because the friction feels the same, but actually the heavier load pushes the surfaces tighter and raises friction; Increasing the normal force does not lighten the interaction; it makes the surfaces press harder, not softer.
Key Concepts
Normal Force and Its Relationship to Friction Coefficient
Topic
Friction Coefficient Variations
Difficulty
easy level question
Cognitive Level
understand
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