Gravity

Two identical particles of mass m are placed at a distance r from each other. If their separation is doubled, then the gravitational constant will

• remain the same

• becomes 1/4 of the original one

• be 4 times larger

• becomes doubled

The force of attraction between two bodies at a certain separation is 10N. What will be the force of attraction between them if the separation between them is reduced to half?

On the surface of the earth, the force of gravitational attraction between two masses kept at distance d apart is 6N. If these two masses are taken to the surface of the moon and kept at the same distance d, the force between them will be:

• 6 N

• 1 N

• 36 N

• 1/6 N

Two particles are placed at some distance and the magnitude of gravitational force between them is F. If the mass of each of the two particles is doubled, keeping the distance between them unchanged, the new value of gravitational force, in terms of F, between them will be:

 $G=6.6×10^{-11}$  .

Two point masses each equal to 1 kg attract one another with force of  $10^{-10}$  N. The distance between the two point masses is

• 8 cm

• 80 cm

• 0.8 cm

• 0.08 cm

The gravitational attraction between the two bodies increases when

• their masses are increased and distance is reduced

• their masses are increased and distance is increased

• their masses are reduced and distance is reduced

• their masses are reduced and distance is increased

Which of the following is true for the universal law of gravitation?

• It acts on all the objects irrespective of their nature, shape, and size

• F ∝ (M × m)

• It acts along the line joining the centres of the two objects.

• F ∝ r

The gravitational force between two bodies is 6.67×10^-7 N when the distance between their centres is 10 m. If the mass of first body is 800 kg, then the mass of second body is :

Two spherical balls each of mass 1kg are placed 1cm apart. The gravitational force of attraction between them is

• 6.67 x $10^{-4}$ N

• 6.67 x $10^{-7}$ N

• 6.67 x $10^{-2}$ N

• 6.67 x $10^{-9}$ N

Acceleration due to gravity of a body during free fall does not depend upon the:

• mass of Earth

• mass of the body

• universal gravitational constant

• radius of Earth