Universal Law of Gravitation

Q. Gravitational force acts on all objects in proportion to their masses. Why then, a heavy object does not fall faster than a light object?
[3 marks]

Q.

The centripetal force required for Earth's motion around the Sun is provided by the__________between them.

1. electrostatic force

2. gravitational force

3. magnetic force

4. frictional force

Q.

Ocean tides are caused because of______.

1. Mars

2. Mars

3. Moon

4. Venus

Q.

Compare the gravitational forces exerted by the Sun and the moon on the Earth. Which one exerts a greater force on the Earth? (Given: mass of the Sun, $M_s=4\times {10}^{31}kg$, mass of moon, $M_m=6.3\times {10}^{22}kg$, distance between the Sun and the Earth, $r_{se}=1.3\times {10}^{12}m$ and the distance between moon and the Earth, $r_{me}=4.5\times {10}^{8}m$.

1. Moon exerts a greater force and it is about 76 times the force due to the Sun

2. Sun exerts a greater force and it is about 25 times the force due to moon

3. Both exert equal force on the Earth

4. Sun exerts a greater force and it is about 76 times the force due to the moon

Q. The gravitational force between two bodies is directly proportional to the product of their masses.

1. False
2. True

Q.

The atmosphere is held to the Earth due to:

1. Gravitational force of Earth

2. Gravitational force of Moon

3. Gravitational force of Sun

4. Rotation of Earth

Q. If the gravitational force between two spheres is $400N$, and the distance between them is doubled, the force will be ____________

1. $400N$
2. $200N$
3. $100N$
4. 
   $40N$

Q. Gravitational force is always attractive in nature.

1. True
2. False

Q. The radius of planet $A$ is half the radius of planet $B$. If the mass of $A$ is $M_A$, what must be the mass of $B$ so that the value of $g$ on $B$ is half that of its value on $A$?

1. $3M_A$
2. $4M_A$
3. $M_A$
4. $2M_A$

Q.

The force of gravitation between two bodies in the universe does not depend on:

1. the distance between them

2. the product of their masses

3. the sum of their masses

4. gravitational constant