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Friction Test - 1

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Friction Test - 1
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  • Question 1
    1 / -0

    Rahul was trying to move a heavy block. He applied force but could not move the block. He then called Rohan, but both of them could not move the block. What conclusion can you draw from this?

    Solution

    As the box is not moving, it means frictional force acting is static friction. So, frictional force acting on the block is equal to the applied force.

     

  • Question 2
    1 / -0

    A boy rolls a rubber ball on the wooden floor. The ball travels a short distance before coming to rest. To make the same ball travel longer distance before coming to rest, he may

    Solution

    In order to make the ball travel longer distance, frictional force must be reduced. So, the boy must sprinkle water on the floor..

     

  • Question 3
    1 / -0

    On a rainy day, Rahul wishes to go to the market. He is least likely to slip on the road with

    Solution

    Path laid with marbles and path with loose soil will be slippery as water will reduce the friction. So, he should take the path laid with bricks in order to go to market.

     

  • Question 4
    1 / -0

    Which of the following relations is/are correct?

    Solution

    Rolling friction is always less than the sliding friction because in sliding friction layer rubs each other due to which a lot of kinetic energy is converted heat energy.

     

  • Question 5
    1 / -0

    A book is placed on a table. What type of friction is acting on it?

    Solution

    When the object has no tendency of moving, there is no friction acting on it.

     

  • Question 6
    1 / -0

    Read the following statements and select the correct option.

    Statement A: Shapes of the cars are streamlined.
    Statement B: Streamlined shape reduces the viscous drag.

    Solution

    Shapes of the cars are streamlined because streamlining reduces the viscous drag.

     

  • Question 7
    1 / -0

    Pick up the correct statement.

    Solution

    Friction acting on the object moving in air is less than the friction acting on the object moving in water because air is less dense and has less friction coefficient as compared to water.

     

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