Friction Full Chapter Class 8 Science | NCERT Science Class 8 Chapter 12
Magnet Brainsγ»2 minutes read
Friction is vital for grip and opposing motion, with methods like lubricants and smoothing surfaces used to reduce it. Different types of friction, ways to measure it, and methods to control it for improved performance are discussed.
Insights
- Friction is a force that opposes motion, essential for providing grip when walking and can be reduced by smoothing surfaces or using lubricants like oil and grease.
- The order of friction from least to highest is rolling, sliding, and static friction, with the value of rolling friction being very small, making it efficient for reducing effort in moving objects like suitcases.
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Recent questions
What is friction?
Friction is a force that opposes motion, causing objects to stop or slow down. It is essential for walking on the ground as it provides grip.
How can friction be reduced?
Friction can be reduced by smoothing surfaces, using lubricants like oil or grease, or adding powders like boric acid to increase smoothness.
What is a spring balance used for?
A spring balance is a device used to measure the force acting on an object, with the measurement corresponding to the weight of the object placed on it.
What are some examples of reducing friction in daily life?
Friction can be controlled to enhance performance in activities like carrom or prevent noise in doors by lubricating surfaces. Using rolling functions with ball bearings can reduce effort in carrying briefcases.
How does frictional force depend on speed?
Frictional force depends on speed, with higher speeds reducing frictional force. Objects like boards and airplanes are designed to minimize frictional force for efficient movement.
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