When an object is thrown up, the force of gravity

Newton's law of gravitation is applicable to

If the distance force of masses is doubled, the force between them will be

As we go from the equator to the poles, the value of 'g'

If the earth suddenly shrinks to half its present size, the value of acceleration due to gravity will

The weight of a body of mass 1 kg on earth is

If a planet existed whose mass and radius were both half of those of Earth, the acceleration due to gravity at its surface would be

A stone is dropped from the roof of a building takes 4 s to reach the ground. The height of the building id

In vacuum all freely falling objects

At which of the following locations, the value of g is the largest?

What do you mean by free fall?

Why does an object float or sink when placed on the surface of water?

Distinguish between the terms gravitation and gravity, giving suitable examples.

List three phenomena which can be explained by applying universal law of gravitation.

Define pressure. Give its mathematical expression and its SI unit

A cube of side 5 cm is immersed in water and then in saturated salt solution. In which case will it experience a greater buoyant force. If each side of the cube is reduced to 4 cm and then immersed in water compare the force experienced by the cube, as compared to the first case. Give reasons for each case.

Whenever objects fall towards the earth under the influence of force of gravity alone, we say that the objects are in free fall. The speed of a falling object increases as it comes down i.e., the object has an acceleration. If gravity is the only force, all objects move with the same acceleration near the earth's surface. This acceleration is called the acceleration due to gravity and is denoted by 'g'. The direction of his acceleration is towards the centre of the earth.
(i) What do you mean by the term free fall?
(ii) Define acceleration due to gravity.
(iii) What is the value of 'g' on the surface of the earth?
(iv) What is the direction of acceleration due to gravity?

Give reasons.
(i) Moon does not have atmosphere.
(ii) If you jump on the moon, you will rise much higher than, if you jump on the earth.

Differentiate between 'g' and 'G' in a tabular form.

State Archimedes' principle? Write two applications of Archimedes' principle.

(i) Explain, why a completely immersed bottle in water bounces back on the surface?
(ii) Why does a bucket of water weighs less inside the well water?