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Friction Test - 12

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Friction Test - 12
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  • Question 1
    1 / -0
    Which among the following is best lubricant?
    Solution

      A good lubricant generally possesses the following characteristics:

      1) High boiling point and low freezing point (in order to stay liquid within a wide range of temperature)

      2) High viscosity index

      3) Thermal stability

      4) Hydraulic stability

      5) Corrosion prevention

      6) High resistance to oxidation.

      Now, only liquids can have all the above properties.

  • Question 2
    1 / -0
    The limiting friction between two surfaces does not depend
    Solution
    Limiting friction is the maximum friction that can be generated between two static surfaces in contact with each other. Once a force applied to the two surfaces exceeds the limiting friction, motion occurs. 
    The limiting friction between two surfaces does not depend on height of the body.
  • Question 3
    1 / -0
    A good lubricant should be highly
    Solution
    A  good lubricant should be highly viscous and non-volatile because due to viscosity the lubricant will stick between the solids and it overcomes the friction between the two surfaces that are in contact. 
    Due to non-volatility the lubricant will not evaporate and it will remain between contact surfaces acting as a lubricant.
  • Question 4
    1 / -0
    When a person walks on a rough surface
    Solution
    Person exerts force on the ground which causes the ground to exert the frictional force. This force helps to move forward. If there is no frictional force like on the ice, a person cannot walk.
  • Question 5
    1 / -0
    Sand is dusted to the railway tracks during rainy season to:
    Solution
    Sand is dusted to the railway tracks to reduce the smoothness of the track. This results in increase of friction.
  • Question 6
    1 / -0
    Aeroplanes are streamlined to reduce:
    Solution
    Fluid friction occurs when a solid object travels through a liquid or gas. Aeroplanes are streamlined to reduce the fluid friction.
  • Question 7
    1 / -0
    If we imagine ideally smooth surfaces kept in contact, the frictional force acting between them is :
    Solution
    If we imagine ideally smooth surface kept in contact, the frictional force acting between them is zero because there are no irregularities in the surface to interlock the other surface. Interlocking is the reason behind friction. Its absence means there will be no friction between these surfaces to resist the motion whenever they move relative to each other.
  • Question 8
    1 / -0
    A ball moving on a table top eventually stops. What is the reason ?
    Solution
    Due to the force of friction between the ball and table top, it  opposes the motion of the ball. And, gradually its speed keeps on decreasing and the ball finally stops.
  • Question 9
    1 / -0
    In a large commercial complex there are four ways to reach the main road. One of the path has loose soil, the second is laid with polished marble, the third is laid with bricks and the fourth has gravel surface. It is raining heavily and Paheli wishes to reach the main road. The path on which she is least likely to slip is:
    Solution
    The only path will have sufficient frictional force to walk easily, hence the answer is (d) gravel.
  • Question 10
    1 / -0
    Friction can be increased by increasing:
    Solution
    Rough surface is uneven so it provides more resisitance to motion of a body hence the frictional force increases.
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