Q. Why does a long
bar helps a tight rope walker to keep his balance?
Ans. It works on the principle of moment. is the second
condition of equilibrium. When sum of the torques acting on a body is equal to
zero the body is said to be in equilibrium. The rope walker adjusts the amount
of torque by increasing or decreasing the length of the bar on either side of
the rope so it will help him to be in equilibrium.
Q. When the divers
and acrobats wishes to make several somersaults, they pull their hands towards
body. Why?
Ans. When divers and acrobats wish to make several
somersaults they pull their hands close to the body in order to rotate at
higher rates. Due to close distribution of masses the moment of inertia
decreases. This causes an increase in the angular velocity enabling them to
make several somersaults.
Q. Is the normal
force on the tyres of car is equal?
Ans. No. The normal force on the tyres is equal because the
position of the engine shifts the center of mass of anybody. So the normal
force on the tyres on the front side (because normally the engine is at the
front side) has the grater normal force because they are close to the centre of
mass.
Q. Why do you keep
your legs apart when you have to stand in the aisle of a bumpy-riding bus?
Ans. It works on the principle of moment. is the second
condition of equilibrium. When sum of the torques acting on a body is equal to
zero the body is said to be in equilibrium. So by keeping the legs apart we
Increases the moment of inertia and decrease the angular velocity it will help
us in order to continue our state and
avoiding the falling.
Q. You are falling of
the edge, What should you do to avoid falling?
Ans. In order to avoid falling we adjust our body in such a
manner that the center of our mass should be in lined with the surface we are
standing by doing this we can avoid falling of the edge. For this we moves our
body forward and backward to find a point where our body becomes in equilibrium.
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