PLEASE GIVE THE NOTES OF CHAPTER *GRAVITATION* class 9 and also some extra questions!!
PLEASE ITS SUPER URGENT
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hey mate :-)
your answer is:–
Topics in the Chapter
• Introduction
• Newton's Unversal law of Gravitation
→ Relationship between Newton's 3rd law and Newton's law of gravitation
→ Importance of universal law of gravitation
• Free fall of an object and acceleration due to gravity
→ Value of g
→ Relationship between G and g
• Mass
• Weight
• Difference between Mass and Weight
• Factors that affect value of g
• Thrust and Pressure
• Buoyancy
• Density
• Archimede's Principle
→ Application of Archimede's Principle
• Relative ration
• Solved Numericals
Introduction
→ Gravitational Force of Earth: If we release a small stone without pushing it from a height, it accelerates towards earth.
→ The stone is when accelerated towards earth, means some force is acting on it. The force which pulls the objects towards the centre of the earth is known as gravitational force of the earth.
→ Here, stone also attracts earth. It means every object in universe attracts every other object.
Newton’s Universal Law of Gravitation
→ Sir Isaac Newton in 1687 proposed a law about the force of attraction between the two objects in the universe which is known as Newton’s law of gravitation.

According to Universal law of Gravitation
→ Every mass in this universe attracts every other mass with a force which is directly proportional to the product of two masses and inversely proportional to the square of the distance between them.
• Let masses (M) and (m) of two objects are distance (d) apart, then force of attraction (F) between them
F ∝ M×m
F ∝ 1/d2
F ∝ Mm/d2
F = (GMm)/d2
where,
G is a constant and is known as Gravitational constant.
Value of G = 6.67×10-11 Nm2/kg2
G is called universal gravitational constant.
→ If unit of F is in Newton, m is in kg, d is in metre, then unit of G can be calculated as :
G = (F×d2)/Mm, therefor unit will be Nm2/kg2
Relation between Newton’s third law of motion and Newton’s law of gravitation
→ According to Newton’s third law of motion, “Every object exerts equal and opposite force on other object but in opposite direction.”
→ According to Newton’s law of gravitation, “Every mass in the universe attracts the every other mass.”
→ In case of freely falling stone and earth, stone is attracted towards earth means earth attracts the stone.
→ But according to Newton’s third law of motion, the stone should also attract the earth.
It is true that stone also attracts the earth with the same force F = m × a but due to very less mass of the stone, the acceleration (a) in its velocity is 9.8 m/s2 and acceleration (a) of earth towards stone is 1.65×10-24 m/s2 which is negligible and we cannot feel it.
Importance of universal law of gravitation
(i) The force that binds us to the earth.
(ii) The motion of moon around the earth.
(iii) The motion of earth around the sun.
(iv) The tides due to moon and the sun.
I can't give you all but few are in this ...
#mark me brainliest
your answer is:–
Topics in the Chapter
• Introduction
• Newton's Unversal law of Gravitation
→ Relationship between Newton's 3rd law and Newton's law of gravitation
→ Importance of universal law of gravitation
• Free fall of an object and acceleration due to gravity
→ Value of g
→ Relationship between G and g
• Mass
• Weight
• Difference between Mass and Weight
• Factors that affect value of g
• Thrust and Pressure
• Buoyancy
• Density
• Archimede's Principle
→ Application of Archimede's Principle
• Relative ration
• Solved Numericals
Introduction
→ Gravitational Force of Earth: If we release a small stone without pushing it from a height, it accelerates towards earth.
→ The stone is when accelerated towards earth, means some force is acting on it. The force which pulls the objects towards the centre of the earth is known as gravitational force of the earth.
→ Here, stone also attracts earth. It means every object in universe attracts every other object.
Newton’s Universal Law of Gravitation
→ Sir Isaac Newton in 1687 proposed a law about the force of attraction between the two objects in the universe which is known as Newton’s law of gravitation.

According to Universal law of Gravitation
→ Every mass in this universe attracts every other mass with a force which is directly proportional to the product of two masses and inversely proportional to the square of the distance between them.
• Let masses (M) and (m) of two objects are distance (d) apart, then force of attraction (F) between them
F ∝ M×m
F ∝ 1/d2
F ∝ Mm/d2
F = (GMm)/d2
where,
G is a constant and is known as Gravitational constant.
Value of G = 6.67×10-11 Nm2/kg2
G is called universal gravitational constant.
→ If unit of F is in Newton, m is in kg, d is in metre, then unit of G can be calculated as :
G = (F×d2)/Mm, therefor unit will be Nm2/kg2
Relation between Newton’s third law of motion and Newton’s law of gravitation
→ According to Newton’s third law of motion, “Every object exerts equal and opposite force on other object but in opposite direction.”
→ According to Newton’s law of gravitation, “Every mass in the universe attracts the every other mass.”
→ In case of freely falling stone and earth, stone is attracted towards earth means earth attracts the stone.
→ But according to Newton’s third law of motion, the stone should also attract the earth.
It is true that stone also attracts the earth with the same force F = m × a but due to very less mass of the stone, the acceleration (a) in its velocity is 9.8 m/s2 and acceleration (a) of earth towards stone is 1.65×10-24 m/s2 which is negligible and we cannot feel it.
Importance of universal law of gravitation
(i) The force that binds us to the earth.
(ii) The motion of moon around the earth.
(iii) The motion of earth around the sun.
(iv) The tides due to moon and the sun.
I can't give you all but few are in this ...
#mark me brainliest
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