question_answer1) What is the advantage of the concept of centre of mass?
question_answer2) Should the centre of mass of a body necessarily lie inside the body?
question_answer4) Is centre of mass a reality?
question_answer9) A body is in rotational motion. Is it necessary that a torque be acting on it?
question_answer10) Why do we prefer to use a wrench of longer aim?
question_answer12) It is difficult to open the door by pushing it or pulling it at the hinge. Why?
question_answer15) Why it is easier to open a tap with two fingers than with one finger?
question_answer17) Can the couple acting on a rigid body produce translatory motion?
question_answer20) If no external torque acts on a body, will its angular velocity remain conserved?
question_answer22) Define the term angular impulse.
question_answer23) Which component of linear momentum does not contribute to angular momentum?
question_answer27) Is a body in circular motion in equilibrium?
question_answer28) When is a body lying in a gravitation field in stable equilibrium?
question_answer29) Can a body in equilibrium while in motion? If yes, give an example.
question_answer30) The bottom of a ship is made heavy. Why?
question_answer31) Why does a girl lean towards right while carrying a bag in her left hand?
question_answer33) Standing is not allowed in a double decker bus. Why?
question_answer34) Why we cannot rise from a chair without bending a little forward?
question_answer35) A system is in stable equilibrium. What can we say about its potential energy?
question_answer36) Why is moment of inertia also called rotational inertia?
question_answer37) Give the physical significance of moment of inertia.
question_answer39) Does the moment of inertia of a rigid body change with the speed of rotation?
question_answer40) About which axis, the moment of inertia of a body is minimum?
question_answer42) About which axis would a uniform cube have a minimum rotational inertia?
question_answer43) Is radius of gyration a constant quantity?
question_answer44) Does the radius of gyration depend upon the speed of rotation of the body?
question_answer48) What is the advantage of the flywheel?
question_answer49) Why spokes are provided in a bicycle wheel?
question_answer53) What is the use of flywheel in railway engine?
question_answer57) A cat is able to land on its feet after a fall. Why?
question_answer58) Why there are two propellers in a helicopter?
question_answer59) The speed of a whirl wind in a tornado is alarmingly high. Why?
question_answer60) If earth contracts to half its radius, what would be the length of the day?
question_answer69) If earth were to shrink suddenly, what would happen to the length of the day?
question_answer75) Why are we not able to rotate a wheel by pulling or pushing along its radius?
question_answer84) What is the difference between centre of gravity and centre of mass?
question_answer89) Torque and work are both equal to force times distance. Then how do they differ?
question_answer91) Define moment of inertia. On what factors does it depend?
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