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Friction Test - 1

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Friction Test - 1
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  • Question 1
    1 / -0

    A ball rolling on ground slows down and finally stops because of

    Solution

    Explanation:

    A ball rolling on ground slows down and finally stops because of friction offered by ground. Frictional force works in opposite direction of motion that's why it slows down the motion of a ball.

     

     

  • Question 2
    1 / -0

    Friction depends on the ____________ of surface.

    Solution

    Explanation:

    Friction depends on the smoothness/ nature  of the surface. Smoother surface offer less resistance as there will be less irregularities in surface  which reduce the friction. As irregularities of the surface make the surface rough or smooth.

     

     

  • Question 3
    1 / -0

    A force which opposes the motion is called

    Solution

    Explanation:

    A force which opposes the motion is called friction.  It generates when two surfaces are in contact with each other.Friction depends upon the type of surface whether smooth or rough. Rough surface offers more friction.

     

     

  • Question 4
    1 / -0

    Friction opposes the __________ between two surfaces in contact.

    Solution

    Explanation:

    Friction opposes the relative motion between two surfaces in contact. Frictional force acts in opposite direction of motion to slow down the speed of moving body.

     

     

  • Question 5
    1 / -0

    In machine, friction between moving part is reduced by

    Solution

    Explanation:

    In machine, friction between moving part is reduced by using lubricants. These lubricants fill the irregularities of the surface and make it smoother.

     

     

  • Question 6
    1 / -0

    The heat in metals is conducted by the process of

    Solution

    Explanation:

    The process of heat transfer in which particles transfer heat one after the other in contact is called conduction. The heat in metals is conducted by the process of conduction because molecules in solid are tightly packed. they just transfer their energy to adjacent molecule without leaving their place.

     

     

  • Question 7
    1 / -0

    Fluid friction can be minimized by

    Solution

    Explanation:

    . Liquid and gases are called fluid. Friction in fluid can be minimized by giving suitable shape called streamline shape. As streamlined shape is narrow at the ends and broader in the middle due to which it reduces the fluid friction and helps an object to move forward easily.

     

     

  • Question 8
    1 / -0

    Sprinkling of powder on the carom board

    Solution

    Explanation:

    Sliding friction is less than static friction.Powder fill the rough surface of carrom board due to which friction between the carrom coins and the board reduces and coins slides easily.

     

     

  • Question 9
    1 / -0

    Sliding friction is ______________ than static friction.

    Solution

    Explanation:

    Sliding friction is less than static friction.  When an object slides its surface didn't get enough time to be in contact with the surface of other due to which it becomes easier to slide the object.

     

     

  • Question 10
    1 / -0

    Friction produces

    Solution

    Explanation:

    Friction produces heat. When two  surfaces in contact rub each other produces friction resulting in the production of heat.All machines get warm due to this.

     

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