Friction Quiz - CBSE Class 8 Science

Free practice quiz: Friction (CBSE Class 8 Science). 12 multiple-choice questions with answers and explanations. Play online, no sign-up needed.

This CBSE Class 8 Science practice quiz has 12 multiple-choice questions on Friction, and 12 of them come with an explanation. Try the 5 sample questions below (tap an option to check yourself), then play the full quiz online. No sign-up needed.

Sample questions

1. Which surface would cause more friction: a smooth wooden floor or a carpeted floor?

   1. Smooth wooden floor
   2. Carpeted floor
   3. Both the same
   4. Neither
   Show answer

   Answer: B. Carpeted floor

   Carpeted floors have a rougher surface than smooth wooden floors, leading to more friction.

2. Explain how lubricants reduce friction.

   1. They increase surface roughness
   2. They create a smoother surface between objects
   3. They add more weight to the objects
   4. They make objects stick together
   Show answer

   Answer: B. They create a smoother surface between objects

   Lubricants fill in the gaps between surfaces, creating a smoother, less resistant layer that reduces friction.

3. How does the weight of an object affect the friction between it and a surface?

   1. Heavier objects create less friction
   2. Heavier objects create more friction
   3. Weight doesn't affect friction
   4. It depends on the surface
   Show answer

   Answer: B. Heavier objects create more friction

   The greater the force pushing the object against the surface (weight), the greater the friction.

4. A car's tires are designed with specific tread patterns. How does this relate to friction and safety?

   1. Treads reduce friction for better speed
   2. Treads increase friction for better grip
   3. Treads have no effect on friction
   4. Treads decrease safety
   Show answer

   Answer: B. Treads increase friction for better grip

   Tire treads increase the surface area in contact with the road, creating more friction and therefore better grip and control, enhancing safety.

5. Discuss the advantages and disadvantages of friction in everyday life, providing specific examples for each.

   1. Only advantages exist
   2. Only disadvantages exist
   3. Advantages outweigh disadvantages
   4. Disadvantages outweigh advantages
   Show answer

   Answer: C. Advantages outweigh disadvantages

   Friction is essential for many actions (walking, writing, braking), but it also causes wear and tear (engine parts, tires). While it causes energy loss, the benefits often outweigh this cost.

More questions in this quiz

Answers and explanations are in the full quiz.

1. Why is it easier to push a heavy box across a smooth surface than a rough surface?
2. A hockey puck slides farther on ice than on grass. Why?
3. Describe the relationship between friction and the type of surfaces in contact.
4. Explain how rolling friction differs from sliding friction, providing an example of each.
5. Explain the concept of 'coefficient of friction' and how it relates to different materials.
6. Design an experiment to investigate how different surface textures affect the friction between two objects. Describe your methodology, variables, and expected results.
7. Analyze the role of friction in the operation of a bicycle, identifying where friction is beneficial and detrimental to its function.

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