question_answer5)
Calculate
the average density of earth in terms of g, G and R.
question_answer7)
Given
find the weight of a 5 kg object on
(i) earth and (ii) moon.
question_answer14)
A
stone is dropped from a cliff. What will be its speed when it has fallen 100 m?
question_answer17)
Give
two reasons for the variation of g at the equator and at the poles.
question_answer30)
Give
the characteristics of gravitational force.
question_answer36)
Write
the standard equations in the form when an object is dropped from a height?
question_answer66)
State
two factors on which the gravitational force between two objects depends.
question_answer67)
What
would happen if the centrifugal force between moon and earth vanish away?
question_answer69)
How
is acceleration due to gravity of a falling body related to its mass?
question_answer70)
Which
force bring tides in the ocean?
question_answer71)
Identify
the device used to measure weight of a body.
question_answer72)
How
does the weight of a body vary with its height.
question_answer73)
Name
the device used to measure mass of a body.
question_answer76)
The
astronauts in space feel weightless. Why?
question_answer77)
What
will be mass and weight of a unit mass at the centre of earth ?
question_answer78)
Why
should the bullet be fired a little above the line of target?
question_answer81)
Does
air resistance very with surface area of the body?
question_answer84)
What
keeps the moon in uniform circular motion around the earth?
question_answer85)
What
is the final velocity, when a body is dropped from a height?
question_answer86)
Which
force causes things to fall towards the earth?
question_answer87)
Anu
buys 100 g of gold at the poles. What will be the weight of gold at equator?
question_answer94)
When
do we use the term 'force of gravity' rather than' force of gravitation'?
question_answer95)
At
which place on the earth, the acceleration due to gravity is zero.
question_answer96)
Where
can the weight of a body be zero, apart from the centre of the earth?
question_answer98)
Name
the scientist who determined the value of universal gravitational constant.
question_answer104)
In
Newton's universal law of gravitation, what does universal mean ?
question_answer105)
How
does the value of g vary with height above the ground?
question_answer107)
What
do you mean by free fall? [NCERT]
question_answer108)
Why
is 'G' called the universal gravitational constant?
question_answer109)
Who
formulated the universal law of gravitation?
question_answer110)
How
is gravitation different from gravity?
question_answer111)
What
does a small value of G indicate?
question_answer112)
At
what place on the earth's surface is the weight of a body maximum?
question_answer113)
At
what place on the earth's surface is the weight of a body minimum?
question_answer115)
Do
fluids possess weight?
question_answer116)
Why
can one jump higher on the surface of the moon than on the earth?
question_answer117)
Define
the standard kilogram.
question_answer119)
Is
weight a force?
question_answer120)
What
keeps the moon in uniform circular motion around the earth?
question_answer121)
When
a body is dropped from a height, what is its initial velocity?
question_answer122)
When
a body is thrown vertically upwards, what is its final velocity?
question_answer129)
State
the universal law of gravitation.
question_answer132)
When
does an object show weightlessness?
question_answer134)
What
do you mean by acceleration due to gravity? [NCEAT]
question_answer147)
What
is the importance of universal law of gravitation? [NCERT]
question_answer148)
What
is the acceleration of free fall? [NCERT]
question_answer151)
What
are the differences between the mass of an object and its weight?
[NCERT]
question_answer152)
Why
is the weight of an object on the moon 
th its weight on the earth? [NCERT]
question_answer154)
Show
that the weight of an object on the moon is 
of its weight on the earth.
question_answer157)
Why
does formation of tides takes place in sea or ocean?
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