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Q.1 What is gravitation or gravitational force?
Ans: The force with which any two objects attract each other is called gravitation or gravitational force.
Q.2. State the factors that affect the gravitational force.
Ans: The factors that affect the gravitational force are:
(i) mass of two heavenly bodies
(ii) distance between
their centers
Q.3. What geocentric theory?
Ans: Geocentric theory states that the earth remains at the centre of the universe and the sun, moon and other planets revolve around
the earth.
Q.4? .What is heliocentric theory?
Ans: Heliocentric theory states that the sun lies at the center of the universe and at the planets and satellites revolve around the sun.
Ans: Newton's universal law of gravitation states that, "The force of attraction between two bodies is directly proportional to the product of their masses an inversely proportional to the square of the distance between their centers.
Q.6. When was Newton's law of gravitation propounded?
Ans: Newton's law of gravitation was propounded in 1687 AD.
Ans: Newton's gravitational constant (G) is the gravitation existing between two bodies of unit masses placed at a unit distance from their centers.
The numerical value of gravitational constant (G) is 6.67 x 10-11 and
its SI unit is.
Nm^2/kg^2 .
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