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Gravitation · गुरुत्वाकर्षण

Why things fall, why the Moon goes round, and why you would weigh less on the Moon.

Gravitation games

Universal law of gravitation गुरुत्वाकर्षण का सार्वत्रिक नियम

Every object in the universe attracts every other object. The force is F = G m₁m₂ / r²: it grows with the masses and falls with the square of the distance. G ≈ 6.67 × 10⁻¹¹ N m²/kg² (the same everywhere).

ChangeForce becomes
distance × 2¼
distance × 31/9
distance ÷ 2× 4
one mass × 2× 2
both masses × 2× 4

Mass and weight द्रव्यमान और भार

MassWeight
What it isamount of matterforce of gravity on the body
Unitkilogram (kg)newton (N)
Changes with place?NoYes (W = mg)
On the Moonsameabout 1/6

g (acceleration due to gravity) ≈ 9.8 m/s² on the Earth's surface. It is a little more at the poles than at the equator, and less as you go up. Also see laws of motion, equations of motion and the solar system.

Goes with NCERT Science Class 9, Chapter Gravitation. g = 9.8 m/s²; G ≈ 6.67 × 10⁻¹¹ N m²/kg² (NCERT gives 6.673 × 10⁻¹¹).

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A one-page chart to stick on the wall, and a worksheet to practise.

Gravitation

Universal law of gravitation गुरुत्वाकर्षण का सार्वत्रिक नियम

Every object in the universe attracts every other object. The force is F = G m₁m₂ / r²: it grows with the masses and falls with the square of the distance. G ≈ 6.67 × 10⁻¹¹ N m²/kg² (the same everywhere).

ChangeForce becomes
distance × 2¼
distance × 31/9
distance ÷ 2× 4
one mass × 2× 2
both masses × 2× 4

Mass and weight द्रव्यमान और भार

MassWeight
What it isamount of matterforce of gravity on the body
Unitkilogram (kg)newton (N)
Changes with place?NoYes (W = mg)
On the Moonsameabout 1/6

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Gravitation — worksheet

Name: ____________________ Class: ______ Date: __________

1. F = G ______ / ______
2. If the distance between two bodies is doubled, the force becomes ________
3. Weight of a 50 kg girl on the Earth (g = 9.8 m/s²) = ________
4. A man weighs 720 N on the Earth. On the Moon he weighs about ________
5. Two differences between mass and weight: ____________________
6. Why does a feather fall slower than a stone in air? ____________

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