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Forces and Laws of Motion Test - 24

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Forces and Laws of Motion Test - 24
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  • Question 1
    1 / -0
    A particle is moving with a constant speed along a straight line path. A force is not required to:
    Solution
    • Newton's first law states that, if a body is at rest or moving at a constant speed in a straight line, it will remain at rest or keep moving in a straight line at constant speed unless it is acted upon by a force. This postulate is known as the law of inertia.
    • Hence a force is not required to keep the particle moving with uniform speed.
  • Question 2
    1 / -0
    Which of the following class of forces is different from others?
    Solution
    Pulling of a cart, stretching of a coiled spring and kicking of a ball take place due to contact forces but weight of the body (gravitational force) is a non-contact force.

    Hence option $$D$$ is correct.
  • Question 3
    1 / -0
    Newton's third law of motion can be used to explain:
    Solution
    A man applies a force on water in the backward direction while swimming and according to Newton's third law, the water pushes the man with equal force in the forward direction and thus the man swims forwards.
    Similarly, during the motion of a rocket, the gases exhausted in the backward direction gives a finite thrust to the rocket in the forward direction and thus helps it to move forwards.
    Hence option D is correct.
  • Question 4
    1 / -0
    When a magnet is dropped it falls to the ground. The force which makes this happen is an example of
    Solution
    The only force acting on the magnet is the gravitational force in the downward direction and hence this is an example of an unbalanced force.
  • Question 5
    1 / -0
    When a fire man directs a powerful stream of water on a fire from a hose pipe, the hose pipe tends to go backward. This is an example of Newton's:
    Solution
    According to Newton's 3rd law of motion, every action has equal and opposite reaction.
    Thus stream of water going in forward direction exerts a force on the hose pipe in the backward direction which makes hose pipe to go backwards.
  • Question 6
    1 / -0
    The mass of object A is 5 kg, that of object B is 40 kg, that of object C is 38 kg, and that of object D is 56 kg. Which object has the greatest inertia?
    Solution
    The object having the greatest mass has the greatest inertia because more force is required to change the initial state of the object.
    Thus object D has the greatest inertia.
  • Question 7
    1 / -0
    Newton's second law gives a measure of
    Solution
    According to Newton's second, law, rate of change of momentum is directly proportional to applied force.
    $$ F \space  \alpha \space \dfrac {m(v-u)}{t} $$
    Form this, we deduce that,
    $$F= ma $$
    So, Newton's second law gives us measure of force.
  • Question 8
    1 / -0
    The inertia of a moving body makes it:
    Solution
    Inertia is a physical property that offers resistance to change in the state of motion of an object i.e an object tends to remain in its initial state of motion when no external force is applied to it.
  • Question 9
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    When a body is stationary :
    Solution
    For the body to be stationary, net external force acting on it must be equal to zero which is possible only when the combination of forces acting on it balance each other.
  • Question 10
    1 / -0
    If the net force acting on a body is doubled, the acceleration of the body is 
    Solution
    According to newton's second law,
     $$ F=  \space ma $$
    So, if force is doubled, a is also doubled. 
    Option B is correct.
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