The acceleration due to gravity on the moon is 1 . 67 m / s 2 . If the radius of the moon is 1 . 74 × 10 6 m , then calculate the mass of the moon.

Given Acceleration due to gravity, g = 1 . 67 m / s 2 Radius of the moon, R = 1 . 74 × 10 6 m The equation for acceleration due to gravity is, g = G M R 2 ⇒ M = g R 2 G The mass of the moon is, M = g R 2 G = 1 .67 × ( 1 .74 × 10 6 ) 2 6 .67 × 10 − 11 = 7 .6 × 10 22 kg

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LIVING SCIENCE PHYSICS 9>Chapter 3 - Gravitation>Check Your Progress>Q 9

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An object is dropped from a certain height. After $2$ seconds, the velocity of the object will be (take $g = 9.8 m / s^{2}$ ).

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Important Questions on Gravitation

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LIVING SCIENCE PHYSICS 9>Chapter 3 - Gravitation>Check Your Progress>Q 10

An object is thrown vertically upwards. Acceleration of the object

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LIVING SCIENCE PHYSICS 9>Chapter 3 - Gravitation>Check Your Progress>Q 11

We see only stone falling towards the earth but not the earth moving towards the stone, even when both the earth and the stone attract each other with an equal and opposite force. Why?

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LIVING SCIENCE PHYSICS 9>Chapter 3 - Gravitation>Check Your Progress>Q 12

Define acceleration due to gravity. Write its SI unit.

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LIVING SCIENCE PHYSICS 9>Chapter 3 - Gravitation>Check Your Progress>Q 13

Distinguish between the universal gravitational constant