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Friction Full Chapter Class 8 Science | NCERT Science Class 8 Chapter 12

Magnet Brains・22 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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Summary

00:00

Understanding Friction: Force Opposing Motion and More

  • Friction is a force that opposes motion, causing objects to stop or slow down.
  • Friction is essential for walking on the ground, as it provides the necessary grip.
  • The direction of friction is opposite to the direction of motion.
  • Spring balance is a device used to measure the force acting on an object.
  • The measurement on a spring balance corresponds to the weight of the object placed on it.
  • Friction can be reduced by smoothing surfaces, which decreases the force required for motion.
  • Sliding friction is the force needed to keep an object in motion.
  • Lubricants like oil and grease are used to reduce friction between machine parts.
  • Adding powder like boric acid to surfaces can increase smoothness and reduce friction.
  • Friction can be controlled to enhance performance in activities like carrom or prevent noise in doors by lubricating surfaces.

18:15

Efficient Rolling Reduces Effort in Carrying Bags

  • The value of role infection of the secretary of pencil soil and resistance promotion reduce is very small, making it easy to roll carry bags with balls inside to reduce effort in carrying briefcases.
  • The rolling function is designed to minimize effort in moving suitcases, with rolling being more efficient than sliding due to ball bearings providing smooth movement.
  • Fluid and VAT, starting as solid and transitioning to liquid and gas, resist friction, with air and water being examples.
  • Frictional force depends on speed, with higher speeds reducing frictional force, and objects like boards and airplanes are designed to minimize frictional force.
  • The order of friction from least to highest is rolling, slide infection, and static friction, with smooth surfaces reducing friction.
  • Fictional forces can be reduced by using smooth shoes without spikes, allowing for easier movement and less interlocking between objects.
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