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Friction Practice Questions

Class 8 · Science · 1085 free MCQs with instant results and detailed explanations.

1085
Total
328
Easy
547
Medium
210
Hard

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Topics in Friction

Types of Friction 369
Factors Affecting Friction 337
Friction in Daily Life 379

Sample Questions from Friction

Here are 10 sample questions. Start a quiz to get randomized questions with scoring.

Q1
Easy
Which type of friction occurs when an object is at rest and requires a force to start moving?
A. Static friction
B. Kinetic friction
C. Rolling friction
D. Fluid friction
Show Answer & Explanation
Correct Answer: A
Static friction acts on objects that are not moving. It prevents motion until a sufficient external force is applied.
Q2
Easy
What type of friction occurs when an object is at rest and not moving?
A. Static friction
B. Kinetic friction
C. Rolling friction
D. Fluid friction
Show Answer & Explanation
Correct Answer: A
Static friction keeps an object at rest, preventing it from moving until a certain threshold is reached.
Q3
Easy
Which type of friction usually occurs when a ball rolls on the ground?
A. Static friction
B. Kinetic friction
C. Rolling friction
D. Fluid friction
Show Answer & Explanation
Correct Answer: C
Rolling friction occurs specifically when an object rolls over a surface, like a ball on the ground.
Q4
Medium
Which type of friction opposes the motion of an object that is already sliding?
A. Static friction
B. Kinetic friction
C. Rolling friction
D. Fluid friction
Show Answer & Explanation
Correct Answer: B
Kinetic friction acts on moving objects and opposes their motion.
Q5
Medium
What is the primary reason for the friction between two surfaces?
A. Weight of the object
B. Surface roughness
C. Air resistance
D. Temperature
Show Answer & Explanation
Correct Answer: B
Surface roughness creates interlocking between surfaces, contributing to friction.
Q6
Medium
If a box is pushed across a floor with a constant speed, what type of friction is acting on it?
A. Static friction
B. Kinetic friction
C. Rolling friction
D. No friction
Show Answer & Explanation
Correct Answer: B
Kinetic friction is present as the box is moving across the surface.
Q7
Medium
Which of the following surfaces would produce the least friction?
A. Sandpaper
B. Ice
C. Concrete
D. Rough wood
Show Answer & Explanation
Correct Answer: B
Ice provides minimal surface roughness, resulting in lower friction levels.
Q8
Hard
Which type of friction occurs when an object is sliding over a surface?
A. Static Friction
B. Kinetic Friction
C. Rolling Friction
D. Fluid Friction
Show Answer & Explanation
Correct Answer: B
Kinetic friction is the friction that acts between moving surfaces, while static friction prevents movement.
Q9
Hard
If the coefficient of static friction between a book and a table is 0.4, what is the maximum static friction force acting on a 10 kg book?
A. 40 N
B. 20 N
C. 10 N
D. 4 N
Show Answer & Explanation
Correct Answer: A
The maximum static friction is calculated using the formula: F_friction = μ * N, where N is the normal force (mg).
Q10
Hard
Which of the following statements about fluid friction is true?
A. It only occurs in liquids.
B. It is always greater than static friction.
C. It can occur in both liquids and gases.
D. It only affects solid objects.
Show Answer & Explanation
Correct Answer: C
Fluid friction occurs when an object moves through a fluid, which can be either a liquid or a gas.

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Friction — Class 8 Science Practice Questions Online

This page contains 1085 practice MCQs for the chapter Friction in Class 8 Science. The questions are organized by difficulty — 328 easy, 547 medium, 210 hard — so you can choose the right level for your preparation.

Every question includes a detailed explanation to help you understand the concept, not just memorize answers. Take a timed quiz to simulate exam conditions, or practice at your own pace with no time limit. This chapter covers 3 topics, giving you comprehensive coverage of the entire chapter.