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Forces and Laws of Motion Test - 3

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Forces and Laws of Motion Test - 3
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  • Question 1
    1 / -0

    Name the force acting on a book rested on the table top.

    Solution

    There are two forces acting on the book- the Earth's gravitational pull which exerts a downward force and the push of the table on the book which pushes the book in the upward direction.

     

  • Question 2
    1 / -0

    Between a football and stone of same size but different masses, stone being heavier the inertia of

    Solution

    The inertia of abody depends on its mass. Inertia of stone is greater than the inertia of football because the mass of stone is higher than the mass of football even both are of the same size.

     

  • Question 3
    1 / -0

    Which of the following is true about action and reaction forces acting on two bodies of equal masses?

    Solution

    Action and reaction forces are equal and opposite. They produce equal and opposite accelerations in the two bodies if the mass of the bodies are equal. 

    The magnitude of the force is same in both cases and as F = ma, so 'a' is same in both cases if the mass of bodies are equal, though it is in opposite directions.

     

  • Question 4
    1 / -0

    Momentum of a body of mass 0.5 kg moving with a speed of 10 m/s is

    Solution

    Here, Msss = 0.5 kg and Velocity = 10 m/s

    Momentum p = mv

    → p = 0.5 × 10

    → p = 5 kg.m/s

     

  • Question 5
    1 / -0

    A force of 10 N acts on a ball moving on a surface. The force of friction that must act between the surface of the ball and the surface so that the ball keeps on moving with constant velocity over the surface must be

    Solution

    The force of friction must be equal to the force acting on the object, that is 10 N in order to balance the force.

     

  • Question 6
    1 / -0

    The people in a bus are pushed backwards when the bus starts suddenly because of

    Solution

    This is due to the fact that because of their inertia, the passengers tend to remain in their state of rest or the stationary state even when the bus has started moving

     

  • Question 7
    1 / -0

    Rockets work on the principle of conservation of

    Solution

    Law of conservation of momentum states that for an isolated system the linear momentum of the system is always conserved. Rockets also work on this law. The momentum of fuel ejected is transferred as the momentum of rocket flying.

     

  • Question 8
    1 / -0

    Two spring balances pull each other in opposite directions. If the reading of one spring balance is 2 N, the reading shown by the second spring balance will be

    Solution

    By the action-reaction pair force, the reading of second spring balance will be 2 N.

     

  • Question 9
    1 / -0

    The force required producing acceleration 2m/s2 on an object of 10 kg mass is

    Solution

    We know that Force = Mass × Acceleration

    → F = 10 kg x 2 m/s2  

            = 20 kg.m/s2

    → F =  20 N.

     

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