MCQ Detailed View

Friction is a resisting force that occurs when two surfaces move or try to move over each other. It opposes motion and can slow down or stop moving objects. Friction depends on the nature of the surfaces and the type of motion between them. There are two main types of friction: sliding friction and rolling friction.

Sliding friction occurs when an object slides over a surface, such as a box being pushed across the floor. Sliding friction is relatively high because the surfaces are in direct contact and irregularities resist motion. Rolling friction, on the other hand, occurs when an object rolls over a surface, like a wheel or ball. Rolling friction is much smaller than sliding friction, which makes rolling objects easier to move.

Because of this, friction can be reduced by changing motion from sliding to rolling. For example:

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  Using wheels or ball bearings in machinery reduces friction and wear.

  
  


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  Trolleys or cars use wheels to move heavy loads easily.

  
  

Other options are incorrect:

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  Rolling to sliding increases friction, not reduce it.

  
  


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  Dynamic to static friction is not about reducing friction; static friction is usually higher.

  
  


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  Potential energy to kinetic energy relates to energy transformation, not friction reduction.

  
  

Reducing friction is critical in mechanical engineering, transportation, and daily life applications, as it saves energy, reduces wear and tear, and increases efficiency. Understanding how rolling reduces friction is a fundamental principle in Physics and mechanics, applicable from bicycles to industrial machines.

In summary, the correct answer is Sliding to rolling, as it significantly lowers friction, allowing objects to move more smoothly and efficiently.