Learning Path
Question & Answer1
Understand Question2
Review Options3
Learn Explanation4
Explore TopicChoose the Best Answer
A
Friction increases with the increase in the normal force.
B
Friction always acts in the direction of motion.
C
The coefficient of friction is a measure of how much frictional force exists between two surfaces.
D
Friction can be reduced by using lubricants.
E
Friction is independent of the types of surfaces in contact.
Understanding the Answer
Let's break down why this is correct
Answer
Friction always opposes relative motion between two surfaces; it never pulls them together. Its magnitude is roughly proportional to the normal force pressing the surfaces together and is largely independent of the contact area. Friction comes in two main types: static friction that resists the start of motion and kinetic friction that acts while objects slide. When friction acts, it turns the kinetic energy of sliding into heat, which is why a rubbed hand feels warm. For example, sliding a book across a table feels harder when the table is rougher or when you press the book harder onto the table.
Detailed Explanation
Increasing the normal force pushes the surfaces together, so the friction force also grows. Other options are incorrect because The belief is that friction pushes the object forward; Some think friction is the same for any surfaces.
Key Concepts
Friction
Normal Force
Coefficient of Friction
Topic
Friction
Difficulty
easy level question
Cognitive Level
understand
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