What do you mean by buoyancy?  - Science

State the universal law of gravitation.

Write the formula to find the magnitude of the gravitational force between the earth and an object on the surface of the earth.

What do you mean by free fall?

What do you mean by acceleration due to gravity?

What are the differences between the mass of an object and its weight?

Why is the weight of an object on the moon 1/6 th 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 find your mass to be 42 kg on a weighing machine. Is your mass more or less than 42 kg?

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?