**Short Questions**

Can you determine the mass of our moon? If yes, then what you need to know? |

Define Force of Gravitation. |

Define orbital velocity. |

Do you attract the Earth or the Earth attracts you? Which one is attracting with a larger force? You or the Earth. |

Does an apple attract the Earth towards it? |

Does the weight of an apple increase, decrease or remain when taken to the top of a mountain? |

Explain Newton’s law of gravitation? |

Explain that the gravitational forces are consistent with Newton’s third law of motion? |

Explain, what is meant by gravitational field strength? |

How can you say that gravitational force is a field force? |

How the mass of the Earth can be determined? |

Moon revolves around the earth, from where it gets necessary centripetal force? |

On what factors the orbital speed of a satellite depends? |

State Law of gravitation. |

What are artificial satellites? |

What are geostationary satellites also write their uses. |

What do you know about geostationary satellites? |

What do you know about Global Positioning System (GPS)? |

What is meant by the force of gravitation? |

What is the field force? |

What is the gravitational force acting on the body placed at the surface of Earth? |

What is the relation between Law of Gravitation and Newton’s Third law of motion? |

What will happen if Earth suddenly stops revolving around the Sun? |

Who gave the idea of gravity? |

Why communication satellites are stationed at geostationary orbits? |

Why does the value of g vary from place to place? |

Why don’t we observe force of attraction between any two objects around us? |

Why earlier scientists could not guess about the gravitational force? |

Why the law of gravitation is important to us? |

With what force an apple weighing 1N attracts the Earth? |

**Long Questions**

A communication satellite is launched at 42000 km above Earth. Find its orbital speed. |

A polar satellite is launched at 850 km above Earth. Find its orbital speed. |

At what altitude the value of g would become one fourth than on the surface of the Earth? |

Calculate the value of g at a height of 3600 km above the surface of the Earth. |

Derive the formula for the orbital speed of an artificial satellite? |

Determine the mass of the earth by using Newton’s law of gravitation. |

Explain the gravitational field? |

Explain the law of gravitation. |

Explain the motion of an artificial satellite and derive the formula for orbital velocity |

Explain the variation of ‘g’ with altitude. |

Find the acceleration due to gravity on the surface of the Mars. The mass of Mars is 6.42 × 10²³ kg and its radius is 3370 km. |

Find the gravitational force of attraction between two spheres each of mass 1000 kg. The distance between the centers of the spheres is 0.5 m. |

Find the value of g due to the Earth at geostationary satellite. The radius of the geostationary orbit is 48700 km |

How Newton’s law of gravitation helps in understanding the motion of satellites? |

How Newton’s law of gravitation helps in understanding the motion of satellites? On what factors the orbital speed of a satellite depends? |

How the mass of Earth can be determined? |

State and explain Newton’s law of gravitation. |

The acceleration due to gravity on the surface of moon is 1.62 ms⁻². The radius of Moon is 1740 km. Find the mass of moon. |

The gravitational force between two identical lead spheres kept at 1 m apart is 0.006673 N. Find their masses. |

The value of g is 4.0 ms⁻² at a distance of 10000 km from the center of the Earth. Find the mass of the Earth. |

What are artificial satellites? Define orbital velocities and what do you know about |

What is the effect of the following on the gravitational acceleration? Mass of a freely falling body. Distance of freely falling body from the center of the Earth. Is there any difference between the values of g at the equator and the poles? Explain. |

Why does the value of g vary from place to place? Explain how the value of g varies with altitude. |

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