Question

Answer these questions .

Q1 write the differences between MASS and WEIGHT?

Q2 derive an expression for gravity due to earth?

Q3 explain universal law if gravitation?​

Answer 1

Explanation:

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In common usage, the mass of an object is often referred to as its weight, though these are in fact different concepts and quantities. In scientific contexts, mass is the amount of "matter" in an object (though "matter" may be difficult to define), whereas weight is the force exerted on an object by gravity.

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f = force between two bodies,

G = universal gravitational constant (6.67×10-¹¹ Nm²/kg²)

m = mass of the object,

M = mass of the earth,

r = radius of the earth.

h = height at which the body is from the surface of the earth.

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Newton's law of universal gravitation. Newton's law of gravitation, statement that any particle of matter in the universe attracts any other with a force varying directly as the product of the masses and inversely as the square of the distance between them.