comparative study of poetic techniques and themes of night of the scropion and indian weavers
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Answer:
(i) Gravitational force is a central as well as conservative force.
(ii) It is the weakest force in nature.
(iii) It is 1036 times smaller than electrostatic force and 10’l8times smaller than nuclear force.
(iv) The law of gravitational is applicable for all bodies, irrespective of their size, shape and
position.
(v) Gravitational force acting between sun and planet provide it centripetal force for orbital
motion.
(vi) Gravitational pull of the earth is called gravity.
(vii) Newton’s third law of motion holds good for the force of gravitation. It means the
gravitation forces between two bodies are action-reaction pairs.
Following three points are important regarding the gravitational force
(i) Unlike the electrostatic force, it is independent of the medium between the particles.
(ii) It is conservative in nature.
(iii) It expresses the force between two point masses (of negligible volume). However, for
external points of spherical bodies the whole mass can be assumed to be concentrated at its
centre of mass.
Note Newton’s law of gravitation holde goods for object lying at uery large distances and also
at very short distances. It fails when the distance between the objects is less than 10-9 m i.e., of
the order of intermolecular distances.
Acceleration Due to Gravity
The uniform acceleration produced in a freely falling object due to the gravitational pull of the
earth is known as acceleration due to gravity.
It is denoted by g and its unit is m/s2
. It is a vector quantity and its direction is towards the
centre of the earth.
The value of g is independent of the mass of the object which is falling freely under gravity.
The value of g changes slightly from place to place. The value of g is taken to be 9.8 m/s2
for
all practical purposes.
The value of acceleration due to gravity on the moon is about. one sixth of that On the earth
and on the sun is about 27 times of that on the earth.