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Friction Test - 19

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Friction Test - 19
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  • Question 1
    1 / -0
    What is drag ?
    Solution
    The other name for fluid friction is drag. It opposes the relative motion of any object in liquids or gases.
  • Question 2
    1 / -0
    A ball rolling along the ground gradually slows down and finally comes to rest, which force is acting over here?
    Solution
    When a ball is rolling on ground ,there is a friction force which retards the motion of ball and makes it stop finally.Because friction always opposes relative motion between two surfaces.This friction force acts between two surfaces .Here this friction is between surface of ball and surface of ground.

    Option A is correct.
  • Question 3
    1 / -0
    Friction is _____ in some situations.
    Solution
    Friction is both desirable and undesirable depending on the situation. For example, the tires of an automobile are grooved to increase friction. However, the ball bearings in the same automobile are regularly oiled to reduce friction and ensure the smooth functioning of the engine.
  • Question 4
    1 / -0
    Fill in the blanks:
    The________ force is the force exerted by a surface on an object when it moves across it or make an effort to move across it.
    Solution
    Frictional force acts between two surfaces to oppose the relative motion between the surfaces. It acts on the body moving across it or trying to move across it.
  • Question 5
    1 / -0
    Fill in the blanks:
    The force responsible for changing the state of motion of a moving object in contact between surface is the _______.
    Solution
    The friction force is the force exerted by a surface an object moving across it. It acts in a direction to oppose the relative motion between objects.
  • Question 6
    1 / -0
    Driving a car on a highway with windows open reduces the speed. This is due to:
    Solution
    With windows open, air comes in and resists the motion of the car. So, due to air resistance, speed of the car reduces.
  • Question 7
    1 / -0
    The taxi driver has to be more careful when driving car in winters because of morning dew. That means the friction on road during winter is _______ friction during summer. Fill in the blank.
    Solution
    A car moves forward due to friction and also can be controlled on road due to friction. Due to the presence of dew, friction in winter is less than that in summer. Hence, as the friction decreases, the possibility of car skidding increases. and the driver needs to be careful. 

  • Question 8
    1 / -0
    Which of the following affects friction?
    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 depends on how hard the two surfaces pressed together.
  • Question 9
    1 / -0
    While the arrow moves towards its target, the force acting on it are due to gravity and due to ____ of air.
    Solution
    When the arrow moves toward target, the force acting on it, is due to gravity and resistive force of air. The resistance force of air is also called as frictional force.  
  • Question 10
    1 / -0
    Which of the following statements is NOT true?
    Solution
    The statement that friction is not useful, is not true. Friction is advantageous in our daily life. Without friction, we will not be able to walk properly, nor drive vehicles even we can write anything on paper etc. 
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