# 10 th, part 1, Gravitation 2 🎷

**What’s App**group of your माहिती विज्ञानाची 🎷👇

😊 **Why is the constant of gravitation called a universal constant G?****Newton’s law of gravitation is called the universal law of gravitation. why**?

Ans:

The value of G does not vary with the distance between the two objects.

The value of G does not change with the nature, mass, or size of the material particles.

The value of G independence of the nature of the **medium** between the two objects.

Hence the value of G is called a universal constant.

This law of gravitation is applicable throughout the universe and to all particles, it is called universal law.

🎷

**If the distance between two bodies is increased by a factor of 3,**

1. The gravitational force between the bodies will decrease by a factor of 9 (if the masses of the body are kept constant.)

1. The gravitational force between the bodies will decrease by a factor of 9 (if the masses of the body are kept constant.)

**🎻**

**State the importance of Newton’s universal law of gravitation.**

Ans

- The importance of Newton’s universal law of gravitation:
- Newton’s universal law of gravitation is explained successfully and with great accuracy following points.
- The motion of the moon and the artificial satellites around the earth.
- The force that
**binds**the objects on the Earth to the Earth 🌎. - The motion of the planets, asteroids, comets ☄️, etc., around the Sun.
- The tides 🌊 of the sea and ocean are due to the Moon 🌝 and the Sun 🌞. (The effect of other planets on Earth’s tides is negligible because it’s so small or large a distance.)

**Take balls of different masses, go to the top of a building, drop them simultaneously, and observe what happens to the balls.**

Ans: The balls reach the ground almost at the same time.

Because the Earth’s gravity provides the

**same acceleration to all objects**, regardless of their mass.

Ans:

No. The heavier object does not accelerate more than a lighter one.

**The two objects will have the same acceleration**.

**Will your weight remain constant as you go above the surface of the earth?**

Ans

No. Our weight does not remain constant as we go above the surface of the earth.

As we go above the surface of the earth, our weight will go on to decrease.

Ans:

Mass is a major of the

**inertia**of the object.

**Defination**: The force with which the earth attracts the body toward the center of the earth is called its weight. Weight, W= mg.

**With a specific initial velocity, we can jump higher on the Moon than on the Earth.**

Ans: The acceleration due to gravity on the Moon (1.63 m/s^2) is about 1/6

of that on the Earth (9.8m/s^2).

Hence, with a specific initial velocity, we can jump higher on the Moon than on the Earth.

Equation:

h= u^2/2g.

⭕ The time taken by the Earth to complete one revolution around the Sun is 3.1 56 × 10^7 s. The distance between the Earth and the Sun is 1.5 × 10^11 m. Find the speed of revolution of the Earth.

**🎇 Shaswat and Swarali are sitting at a distance of 1 m from each other. Their masses are 60 Kg and 90 Kg respectively. What is the gravitational force between them?**

G= 6.67 × 10 ^ – 11N. m^2/ Kg ^2

**Find the magnitude of the acceleration due to gravity at the surface of the earth.**

The magnitude of the acceleration due to gravity at the surface of the earth = 9.8 m/s^2.

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