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Explain the following briefly:
Distinguish between mass and weight of an object. Write at least two points.
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Calculate the weight of an astronaut of mass 66 kg on the surface of the earth and on the surface of the moon. Also calculate the ratio of mass of astronaut on the surface of the earth and on the surface of the moon. Given that acceleration due to gravity on the surface of moon is one-sixth of that on the earth.
If two objects have masses m₁ and m₂ and are separated by a distance d, what happens to the gravitational force between them if the distance is doubled?
An object floats in water because the buoyant force is equal to the weight of the object. If an object is placed in a liquid denser than water, what happens to the buoyant force?
What is the difference between thrust and pressure?
