Newton's Laws and Motion
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Questions and Answers

What happens to the mass of a body when its velocity is comparable to the velocity of light?

  • It increases (correct)
  • It becomes zero
  • It remains the same as its rest mass
  • It decreases

    • What is the condition for a system or a body to be in equilibrium?

  • The net force acting on it is zero (correct)
  • The net force acting on it is minimum
  • The net force acting on it is infinite
  • The net force acting on it is maximum

    • What is the relationship between inertia and mass of a body?

  • Inertia is directly proportional to the mass of the body (correct)
  • Inertia is unrelated to the mass of the body
  • Inertia is inversely proportional to the mass of the body
  • Inertia is proportional to the velocity of the body

    • What is the consequence of a force acting on a body?

    <p>The body undergoes acceleration</p> Signup and view all the answers

    What is the result of placing a weight W in X Pan and a weight W1 in Y Pan in a physical balance?

    <p>The balance becomes balanced</p> Signup and view all the answers

    What is the primary reason why a person does not experience any jerk when the bus is in motion?

    <p>The entire body of the person is in motion with the bus</p> Signup and view all the answers

    What is the main reason why the rider tends to fall backward when a horse starts suddenly?

    <p>The inertia of rest of the upper part of the body</p> Signup and view all the answers

    Why does a bullet fired on a window pane make a clean hole through it, while a ball breaks the whole window?

    <p>The bullet has a higher speed than the ball</p> Signup and view all the answers

    What is the reason why a stone tied to a string flies off along the tangent to the circle when the string breaks?

    <p>The stone's inertia of motion</p> Signup and view all the answers

    What is the inability of a body to change by itself its direction of motion?

    <p>Inertia of direction</p> Signup and view all the answers

    What is the effect of velocity on the length of a rod according to the special theory of relativity?

    <p>The length of the rod decreases with an increase in velocity</p> Signup and view all the answers

    According to the special theory of relativity, what happens to the mass of a body as its velocity increases?

    <p>The mass of the body increases with an increase in velocity</p> Signup and view all the answers

    What is the effect of motion on the clock rate according to the special theory of relativity?

    <p>The clock rate decreases with motion</p> Signup and view all the answers

    What is the condition for rotational equilibrium about a point 'O' in a physical balance?

    <p>Xa = Yb</p> Signup and view all the answers

    What type of balance is it when the masses of the pans are not equal?

    <p>False balance</p> Signup and view all the answers

    What is the force acting on a rope when a person climbs up or down with uniform speed?

    <p>mg</p> Signup and view all the answers

    What is the acceleration of a body moving down a smooth inclined plane of length l, height h and having angle of inclination θ?

    <p>g sin θ</p> Signup and view all the answers

    What is the velocity of a body at the bottom of an inclined plane?

    <p>√(2gl sinθ)</p> Signup and view all the answers

    Where do action and reaction forces act?

    <p>Along the line joining the centres of two bodies</p> Signup and view all the answers

    What is the result of a falling object not falling straight down?

    <p>The earth's rotation causes the object to deflect</p> Signup and view all the answers

    A block of mass m is accelerating on a smooth inclined plane. If the force acting on the block is F, what is the acceleration of the block?

    <p>F / m</p> Signup and view all the answers

    Two blocks, one of mass m1 and the other of mass m2, are connected by a massless string and are on a smooth horizontal surface. If the system is accelerating, what is the tension in the string between the blocks?

    <p>(m1 + m2) * a</p> Signup and view all the answers

    A massive pulley of mass M and radius R is rotating about its axis with an angular acceleration α. What is the net torque acting on the pulley?

    <p>M * R * α</p> Signup and view all the answers

    A string of mass M is stretched between two points. If the force applied to one end of the string is F, what is the acceleration of the block at the other end?

    <p>F / M</p> Signup and view all the answers

    A block of mass m is attached to a horizontal, massless spring of spring constant k. If the block is displaced and then released, what is the acceleration of the block?

    <p>-k / m</p> Signup and view all the answers

    What is the primary characteristic of a body in equilibrium?

    <p>The net force acting on it is zero.</p> Signup and view all the answers

    What is the relationship between the force applied to a body and its resulting acceleration?

    <p>The acceleration is directly proportional to the force.</p> Signup and view all the answers

    What is the unit of force in the CGS system?

    <p>Dyne</p> Signup and view all the answers

    What is the consequence of a force acting on a body in terms of its momentum?

    <p>The momentum of the body changes.</p> Signup and view all the answers

    What is the direction of the force exerted by a rocket on its exhaust gases?

    <p>Backward, opposite to the direction of motion.</p> Signup and view all the answers

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