Forces

Q.

Does the mass affect the velocity ?

Q.

Which force is responsible for holding the solar system together?

Q.

Name the forces demonstrated by the following:

A ball falling freely towards the earth.

Q. Give reasons:
(a) Tides rising above the surface level of the sea.
(b) A concert halls ceiling is mostly curved.
[2 Marks]

Q. Two masses M and 4M are separated by a distance d. What will be the distance of mass 1 kg from M and 4M respectively, so that net gravitational force on it is zero?

1. 
   $\frac{d}{2},\frac{d}{2}$
2. 
   $\frac{d}{3},\frac{2d}{3}$
3. 
   $\frac{2d}{3},\frac{d}{3}$
4. 
   $\frac{d}{4},\frac{3d}{4}$

Q.

The weakest forces of interaction among all classified fundamental forces are?

Q.

If the medium between the Earth and its moon was made 10 times denser, then the gravitational force between the two would increase 10 times.

1. True

2. False

Q. The gravitational force between two heavy bodies is

1. always repulsive
2. always attractive
3. infinite
4. (a) and (b) above.