Q1 of 49 Page 10

State the universal law of gravitation.

Every object in the universe attracts other object by a force of attraction, called gravitation, which is directly proportional to the product of masses of the objects and inversely proportional to the square of distance between them. This is called Law of Gravitation or Universal Law of Gravitation.

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19 An astronaut on the moon measures the acceleration due to gravity and finds it to be 1.67 ms-2. He knows that the earth is about 80 times more massive than the moon. What is his estimate of the ratio of the radius of the earth to that of the moon? 20 Why is the gravitational force of attraction between two bodies of ordinary mass not noticeable in everyday life? 2

Draw a velocity-time graph to represent the motion of a freely falling body towards the surface of the earth.

 3

What do you mean by free fall?