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Friction Test - 14

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Friction Test - 14
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  • Question 1
    1 / -0
    Friction is a type of:
    Solution
    Friction always acts between two contact surfaces of bodies. Hence it is a contact force.
    Friction: When two surfaces try relative motion then the opposition force is called frictional force.
  • Question 2
    1 / -0
    Powder is a lubricant
    Solution
    Powder is a lubricant because it consist of fine particles and makes the surfaces smooth and hence it reduces the friction among surfaces.
  • Question 3
    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.
  • Question 4
    1 / -0
    The frictional force exerted by fluids is called:
    Solution
    Lift is the upward acting force which is against gravity. Drag is the resistance force or friction force in fluid. The rolling friction is a resistive friction when a body rolls on a surface. The dynamic friction is the friction that must be overcome to maintain steady motion of one object relative to another because they remain in contact.
  • Question 5
    1 / -0
    The soles of our shoes wears out because:
    Solution
    When we walk on road, the friction will occur between the soles of our shoes and road so that slipping can be prevented. Thus the road wears out the soles due to friction. 
  • Question 6
    1 / -0
    Which of the following is easier to hold with a greasy palm?
    Solution
    Option D is correct
    The earthen pot is easier to hold because earthen pot is rough, so it has high friction which will prevent it from slipping even at less force. 
  • Question 7
    1 / -0
    Treading of tyres is done to:
    Solution
    The treading of tyres increases the roughness of the surface of the tyre and hence increases the friction.
  • Question 8
    1 / -0
    A ship moving in a sea can't be stopped quickly by applying brakes due to:
    Solution
    The frictional force exerted by water or any fluid is much less than a solid. Hence it takes more time to stop a ship in water.
                       $$\therefore$$ Option A is correct.
  • Question 9
    1 / -0
    When a coin and a feather are dropped simultaneously from the same height, the coin strikes the ground first. This is because of:
    Solution
    The air resistance or friction by air for the feather will be more due to its large surface area. So the coin will go fast and strike the ground.  
  • Question 10
    1 / -0
    The force which prevents us from slipping while walking on the road is:
    Solution
    When we push the ground with our feet, the friction provides a forward reaction to our push and sends us forward. Walking on smooth ground is difficult because the frictional force is not great enough to prevent slipping.

    Option C is correct.
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