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Friction Test - 24

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Friction Test - 24
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  • Question 1
    1 / -0
    Friction on a dry marble floor is ----- than that on a wet marble floor.
    Solution

  • Question 2
    1 / -0
    Friction reduces efficiency of machines due to:
    Solution

    Friction occurs to some degree in almost all situations involving physical objects. In many cases, such as in a running automobile engine, it hinders the process. For example, friction between the moving parts of a machine resists the machine’s motion and turns energy into heat, reducing the machine’s efficiency.
    Option D is correct.

  • Question 3
    1 / -0
    Unevenness in the surfaces of the moving body and the surface on which it moves causes:
    Solution

  • Question 4
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    Any substance which is used to reduce the roughness of a surface is called a:
    Solution
    A lubricant is a substance that helps to reduce friction between surfaces in mutual contact, which ultimately reduces the heat generated when the surfaces move. It may also have the function of transmitting forces, transporting foreign particles, or heating or cooling the surfaces.
  • Question 5
    1 / -0
    Friction can be increased by increasing:
    Solution
    Friction opposes the relative motion between two surfaces in contact. It acts on both surfaces. Friction depends on the nature of surfaces in contact. For a given pair of surfaces, friction depends upon the state of smoothness of those surfaces.
    Friction can be increase by increasing the roughness of the surface.
    Friction can be reduced by using lubricants like grease.
  • Question 6
    1 / -0
    Boats and aeroplanes are ................. so as to reduce fluid friction.fill in the blank.
    Solution
    Boats and aeroplanes are streamlined so as to reduce fluid friction.
    Aeroplanes, boats, fishes and birds which move through fluids have bodies of special shape, called streamlined shape, so as to reduce the friction due to fluid and avoid energy loss. 
    For example,if the boat isn't streamlined, then it also has to push the water out of its way, increasing the drag force.
  • Question 7
    1 / -0
    Frictional force increases when surfaces in contact are made very smooth, because of 
    Solution
    When the contact area is made smooth then the molecular forces between surfaces increases this gives rise to frction. 
    Hence (A) is the correct ans. 
  • Question 8
    1 / -0
    Friction between any two objects is due to
    Solution
    Friction between any two object is due to the irregularities on the surfaces. More the irregular surface more is the friction.
  • Question 9
    1 / -0
    Graphite powder is used in machines to
    Solution
    Graphite powder is used in some machines to reduce friction because graphite powder consist of fine particles and these fine particles stick to surfaces and make them smooth so friction among surfaces is reduced.
  • Question 10
    1 / -0
    To keep machines running smoothly and to avoid wear and tear of machines, the best and the most commonly used lubricant is:
    Solution
    Oil is the best and the most commonly used lubricant used for keeping machines running smoothly and to avoiding wear and tear of machines as it reduces the friction more effectively.
    Because oil being a fluid goes in between all microscopic gaps of machines ,and sticks to it and makes the surfaces smooth hence friction and wear and tear due to friction is reduced.
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