Class 8 Exam > Class 8 Notes > Science Class 8 > Worksheet: Friction
Class 8 Science - Friction CBSE Worksheets
Q.1. Why do kabaddi players rub their hands with dry soil?
Q.2. When does sliding friction come into play?
Q.3. What is done to increase friction between the tyres and road?
Q.4. Name the force responsible for wearing out car tyres.
Q.5. Explain why sportsmen use shoes with spikes.
Q.6. Can we reduce friction to zero by polishing surfaces or using a large amount of lubricants?
Q.7. What is rolling friction?
Q.8. Why do tyres of cars wear out gradually?
Q.9. Explain why the sliding friction is less than the static friction.
Q.10. When we strike a matchstick against the rough surface, it catches fire. Give reason.
Q.11. What is a spring balance?
Q.12. Why do car wheels often spin on icy roads?
Q.13. Iqbal has to push a lighter box and Seema has to push a similar heavier box on the same floor. Who will have to apply a larger force and why?
Q.14. You spill a bucket of soapy water on a marble floor accidentally. Would it make it easier or more difficult for you to walk on the floor? Why?
Q.15. Why will a pencil write on paper, but not on a glass?
You can find Worksheets Solutions here: Worksheet Solutions: Friction
The document Class 8 Science - Friction CBSE Worksheets is a part of the Class 8 Course Science Class 8.
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FAQs on Class 8 Science - Friction CBSE Worksheets
| 1. What is friction and how does it work? |  |
Ans. Friction is the force that resists the motion of an object when it comes into contact with another object or surface. It occurs due to the irregularities present on the surfaces in contact, which interlock and create resistance to movement.
| 2. What are the different types of friction? | |
Ans. There are four types of friction: static friction, sliding friction, rolling friction, and fluid friction. Static friction occurs when there is no relative motion between two objects. Sliding friction occurs when two objects slide past each other. Rolling friction occurs when an object rolls over a surface. Fluid friction occurs when an object moves through a fluid, like air or water.
| 3. How can friction be both beneficial and detrimental? | |
Ans. Friction can be beneficial as it allows us to walk, drive vehicles, and hold objects without them slipping out of our hands. It also enables brakes to stop a moving vehicle and provides traction for tires. However, friction can be detrimental as it causes wear and tear on surfaces, reducing the efficiency of machines and causing heat generation.
| 4. Can friction be reduced or eliminated? | |
Ans. Friction cannot be completely eliminated but can be reduced. Lubricants such as oil or grease are used to reduce friction between surfaces. Smoother surfaces and the use of ball bearings can also reduce friction. In some cases, such as in space or vacuum, where there is no air or fluid, friction is significantly reduced.
| 5. How does friction affect the speed and distance traveled by an object? | |
Ans. Friction acts as a resistive force against motion, so it slows down the speed of an object. The greater the friction, the slower the object will move. Friction also affects the distance traveled by an object as it causes the object to lose energy due to heat generation. This energy loss reduces the overall distance an object can travel.
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