What is gravitational force? - A universal force which acts not only between the two objects on the earth but also between the any two objects in the universe, Who gave three laws describing planetary motion? - Johannes Kepler, What is centripetal force? - A force acts on a any object moving along a circle and is directed towards the centre of the circle, What is ellipse? - An ellipse is the curve obtained when a cone is cut by an inclined plane. It has two focal points., What is the Keplers first law of motion? - The orbit of the planet is an ellipse with the sun at one the foci, What is Keplers second law of motion? - The line joining the planet and the sun sweeps equal area in equal interval of time, What is keplers third law of motion? - The square of palnets period of revolution around the sun is directly propotional to the cube of the mean distance of a planet from the sun , Define Newtons universal law of gravitation? - Every object inthe universe attaracts every other object with a definite force . This force is directly propotional to the product of the masses of the two objects and is inversely propotional to the square of the distance between them., What is G? What is its value in S I unit? - G is the constant of propotionality and is called the universal gravitational constant.In S I unit its value is 6.673x10-11Nm2kg-2. , Why do object fall vertically downwards on the earth? - The centre of mass of the earth is situated at its centre. So the gravitional force on any object due to the earth is always directed towards the centre of the earth., What is acceleration due to gravity? - The gravitational force due to the earth on a body results in its acceleration.This is called acceleration due to gravity and is denoted by g, What is the value of g on the surface of the earth? - Value of g on the surface of the earth is 9.77m/s2, The value of g on the moon is about ----- of the value of the earth - 1/6th, What is mass? - Mass is the amount of matter present in an object., Define weight of an object? - The weight of an object is defined as the force with which the earth attracts the object, What is free fall? - Whenever an object moves under the influence of force of gravity alone , is called as free fall., What is the initial velocity of the object during free fall? - In free fall the initial velocity of the object is zero and goes on increasing due to the acceleration due to gravity of the earth., True free fall can be possible only in ? - Vaccum, What is escape velocity? - When a body is thrown vertically upward from the surface of the earth, the minimum initial velocity of the body for which the body is able to overcome the downward pull by the earth and can escape the earth forever is called escape velocity., When will an object going vertically upwards escape the gravitational force of the earth? - If the object has an initial velocity equal to the escape velocity it will escape the gravitational force of the earth., What is the formula for the escape velocity? - Vesc = √2GM/R, What is the value of escape velocity for earth? - 11.2Km/s,

Gravitation

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