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Friction Test - 15

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Friction Test - 15
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  • Question 1
    1 / -0
    A streamlined body:
    Solution
    A streamline body is a shape such that it helps to reduce the friction between a fluid and an object moving through that fluid. 
  • Question 2
    1 / -0
    You tend to slip when you accidentally step on a banana peel lying on a smooth surface. This is due to:
    Solution
    The surface of the banana peel is so smooth that it is nearly a frictionless surface whose coefficient of friction is very less, and the frictional force applied is less too. So, when we step on the banana peel, our feet don't stop and slips forward, making us fall.
  • Question 3
    1 / -0
    Our palms get warmed up when rubbed together. This is because of:
    Solution
    Friction opposes the relative motion between two surfaces in contact. It acts on both surfaces. Our palm gets warmed up when rubbed together because friction between any two surfaces in motion produces heat.
    The force exerted by a charged body on another charged or uncharged body is known as electrostatic force.
    Every object in the universe, whether small or large, exerts a force on every other object. This force is known as the gravitational force.
  • Question 4
    1 / -0
    Friction is minimised by using
    Solution
    Answer is A.

    Bearings reduce friction by providing smooth metal balls or rollers, and a smooth inner and outer metal surface for the balls to roll against. These balls or rollers 'bear' the load, allowing the device to spin smoothly.
    The concept behind a bearing is very simple. Things roll better than they slide. The wheels on our car are like big bearings. If we had something like skis instead of wheels, our car would be a lot more difficult to push down the road.
    That is because when things slide, the friction between them causes a force that tends to slow them down. But if the two surfaces can roll over each other, the friction is greatly reduced.
  • Question 5
    1 / -0
    Which of the following cannot be used as a lubricant?
    Solution
    Paper is not used as lubricant due to its roughness and  it increases friction.
    So it cannot be used as lubricant.

    Option D is correct.
  • Question 6
    1 / -0
    The surface of a table is smoother as compared to that of a road. This is due to
    Solution
    Answer is B.

    The surface of road has many dips and bumps all along. Also, there are small stone particles are scattered on the road. Whereas, the surface of the table has more or less smooth surface as there are less depressions.
    Hence, The surface of a table is smoother as compared to that of a road due to Less irregularities on the surface of table.

  • Question 7
    1 / -0
    The surface of the head of a matchstick and sides of a match box are deliberately made rough to
    Solution
    Answer is A.

    A match is a small stick of wood or strip of cardboard with a solidified mixture of flammable chemicals deposited on one end. When that end is struck on a rough surface, the friction generates enough heat to ignite the chemicals and produce a small flame. Some matches, called strike-anywhere matches, may be ignited by striking them on any rough surface.
    Hence, the surface of the head of a matchstick and sides of a match box are deliberately made rough to increase friction.
  • Question 8
    1 / -0
    Alida runs her toy car on dry marble floor, wet marble floor, newspaper and towel spread on the floor. The force of friction acting on the car on different surfaces in increasing order will be
    Solution
    Answer is A.

    Force of friction depends on the nature of surface in contact. The rougher the surface, the more is the friction between the surfaces in contact and vice-versa. Roughness present in the given surfaces can be arranged in an ascending order as wet marble floor, dry marble floor, newspaper and towel.
    Hence, the correct sequence of these surfaces when arranged according to the increase in the force of friction acting on the car is - wet marble floor, dry marble floor, newspaper and towel.
  • Question 9
    1 / -0
    Which of the following material is likely to have least friction?
    Solution
    The glass has least friction in compare to Wood, Plastic and Paper. Because its surface is comparatively smoother and provide less resistance force relative motion.
    Hence Option C. 
  • Question 10
    1 / -0
    The frictional force direction is ________ to the direction in which the body tends to move relative to the other.
    Solution
    The direction of the force of friction is such that it opposes the direction of motion that an object would move if there were no frictional force acting on the object.The force of friction f is always opposite the direction the object that is moving . If the object would move, then the direction of the force of friction f will be opposite the movement. If the object would not move when there is no friction, then the force of friction is zero.
    Hence, the statement is true.

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