6. What happens to the force between two objects, if
(i) the mass of one object is doubled?
(iii) the masses of both objects are doubled?
7. What is the importance of universal law of gravitation? -
8. What is the acceleration of free fall? -351
9. What do we call the gravitational force between the earth an
an object? - 346
10. Amit buys few grams of gold at the poles as per the instruction
of one of his friends. He hands over the same when he meets
him at the equator. Will the friend agree with the weight of geld
bought? If not, why? [Hint: The value of g is greater at the
poles than at the equator.) -352
V.11. Why will a sheet of paper fall slower than one that is crumpled
a ball?
(ii) the distance between the objects is doubled and triplekt
Answers
Answer:
6 ( ¡ ) If the mass of one of the objects is doubled, then the force of gravity between them is doubled. If the mass of one of the objects is tripled, then the force of gravity between them is tripled. If the mass of both of the objects is doubled, then the force of gravity between them is quadrupled; and so on.
( ¡¡ ) If the mass of both of the objects is doubled, then the force of gravity between them is quadrupled; and so on. Since gravitational force is inversely proportional to the square of the separation distance between the two interacting objects, more separation distance will result in weaker gravitational forces.
( 7 ) The Importance of Universal law of gravitation lies in the fact, that it was successful in explaining many phenomena such as. (i) how different objects in this universe, affect others, (ii) how gravity is responsible for the weight of a body and keeps us on the ground, (iii) how the lunar motion around the earth occurs.
( 8 ) In Newtonian physics, free fall is any motion of a body where gravity is the only force acting upon it. In the context of general relativity, where gravitation is reduced to a space-time curvature, a body in free fall has no force acting on it.
( 9 )The gravitationalal force between the earth and an object is called the weight of the object. It is also equal to the product of acceleration due to gravity and mass of the object. The weight of any object, w = mg where m is the mass of the object and g is the acceleration due to gravity for the earth (g = 9.8 ms2).
( 10 ) is above in the image
( 11 ) A sheet of paper falls slower then the one crumpled into a ball because the surface area of the ball is much lower than that of the sheet. Thus the upward force exerted by air on the sheet is much as compared to the one exerted on the ball. Hence the sheet falls slower.
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