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Friction Test - 16

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Friction Test - 16
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  • Question 1
    1 / -0
    powder sprinkled on a carrom board
    Solution
    The carom board may sometimes be very rough. Sprinkling powder on a microscopic level, the powder particles offer rolling friction to the striker because of which the striker can be used for smooth and fast play.

  • Question 2
    1 / -0
    Friction is a/an
    Solution
    • Friction is a force that opposes the relative motion between the surface.
    For example, if you apply the force along the left on a book lying on a surface, friction acts along the right. If you apply the force along the right, the friction acts along the left direction. Thus, it is self-adjusting.
    It acts equal to the applied force until it reaches its limiting value. 
    • It's a necessary evil. Though it opposes the motion, it helps us to hold things, helps us to walk, and many more things.
    • It is an important force in daily life. A nail is fixed in the wall due to friction.

    So all the options are correct.
  • Question 3
    1 / -0
    Friction between any two objects is primarily due to :
    Solution
    Friction is caused due to irregularities present on the surface. When we slide an object which has a rough surface over another object which also has a rough surface, the deformities present on the surfaces gets entangled, thus increasing the force required to slide the object over one another. An extra force is required to overcome these irregularities. 
  • Question 4
    1 / -0
    Spikes are provided in the shoes of athlete
    Solution
    Answer is B.

    Spikes are provided on the soles of shoes of athletes to increase the friction between the shoe and the ground.
  • Question 5
    1 / -0
    _______ is responsible for wear and tear of machine parts.
    Solution
    Friction is responsible for wear and tear of machine parts.
    Friction is the main force that is responsible for the wear and tear of machinery, this is why mechanical parts are sometimes oiled, to minimize the friction present.
  • Question 6
    1 / -0
    Which of the following is used to reduce friction :
    1. Streamlines
    2. Use of ball bearings
    3. Lubrication
    Solution
    All the mentioned option are correct.
    Streamlines reduces the friction in fluid.
    Use of ball bearing reduces the friction in machines rotating parts.
    Lubricants are used in machines  and moving parts to reduce friction.

    Option D is correct.
  • Question 7
    1 / -0
    Friction depends upon ................. of surfaces.
    Solution
    Friction depends upon mass and nature of the body of surfaces.
    Friction depends partly on the smoothness of the contacting surfaces, a greater force being needed to move two surfaces past one another if they are rough than if they are smooth. However, friction decreases with smoothness only to a degree; friction actually increases between two extremely smooth surfaces because of increased attractive electrostatic forces between their atoms. 
    Friction does not depend on the amount of surface area in contact between the moving bodies or (within certain limits) on the relative speed of the bodies. It does, however, depend on the magnitude of the forces holding the bodies together. 
    When a body is moving over a horizontal surface, it presses down against the surface with a force equal to its weight, i.e., to the pull of gravity upon it; an increase in the weight of the body causes an increase in the amount of resistance offered to the relative motion of all the surfaces in contact.
  • Question 8
    1 / -0
    Friction arises due to the interlocking of hills and .................. present in a body.
    Solution
    Friction arises due to the interlocking of hills and valleys present in a body.
  • Question 9
    1 / -0
    Fill in the blank.
    Tyres have treads to _______ friction.
    Solution
    The presence of treads on the tyre increases the roughness of the surface. Because of this increased roughness, the contact between the surface of the tyre and the surface of the road is more prominent. So when the wheel tries to roll on the road, the surface of the road tries to oppose it strongly and hence increases the friction. This friction is useful to prevent the wheel from slipping.

  • Question 10
    1 / -0
    When a bicycle travels on a rough surface, its speed
    Solution
    When the bicycle moves on the rough surface, its tires experiance some friction force. The direction of friction in front tire always opposes its motion whereas when cylcist stops pandeling, then back tire also opposes its motion due to frection,  Hence speed of the bicycle will decrease. 
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