What do you mean by free fall?
Why is the weight of an object on the moon 1/6th its weight on the earth?
Why is it difficult to hold a school bag having a strap made of a thin and strong string?
Why does an object float or sink when placed on the surface of water?
You have a bag of cotton and an iron bar, each indicating a mass of 100 kg when measured on a weighing machine. In reality, one is heavier than other. Can you say which one is heavier and why?
How does the force of gravitation between two objects change when the distance between them is reduced to half?
Gravitational force acts on all objects in proportion to their masses. Why then, a heavy object does not fall faster than a light object?
What is the magnitude of the gravitational force between the earth and a 1 kg object on its surface? (Mass of the earth is 6 × 10^{24} kg and radius of the earth is 6.4 × 10^6 m).
What is the acceleration of free fall?
What do we call the gravitational force between the earth and an object?
Why will a sheet of paper fall slower than one that is crumpled into a ball?
A ball is thrown vertically upwards with a velocity of 49 m/s.
Calculate
(i) The maximum height to which it rises,
(ii) The total time it takes to return to the surface of the earth.
A stone is released from the top of a tower of height 19.6 m. Calculate its final velocity just before touching the ground.
A stone is allowed to fall from the top of a tower 100 m high and at the same time another stone is projected vertically upwards from the ground with a velocity of 25 m/s. Calculate when and where the two stones will meet.
The volume of 50 g of a substance is 20 \mathrm{cm}^{3}. If the density of water is 1 g cm^{-3}, will the substance float or sink?
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