g=GMmr2=9.8m/s2.

**Table of Contents**show

## What is gravitation Class 9 very short answer?

Answer: Gravitation is the force of attraction between any two bodies while gravity refers to attraction between any body and the earth.

## What is gravitation Class 9 long answer?

Earth attracts all things towards it through an unseen force of attraction. This force of attraction is called as gravitation or gravitational pull. You must have noticed that every time you throw an object upwards, it reaches a certain height and then falls down on the earth’s surface.

## What are the important topics in gravitation Class 9?

- Gravitation.
- Universal Law of Gravitation.
- Free Fall.
- Acceleration Due to Gravity (g)
- Difference between G and g.
- Mass and Weight.
- Weight of an Object on the Surface of the Moon.

## What is the value of g?

The acceleration due to gravity on Earth or the value of g on Earth is 9.8 m/s2. This implies that, on Earth, the velocity of an object under free fall will increase by 9.8 every second. This acceleration is due to the Earth’s gravity.

## Is weight a force?

Weight is a force that acts at all times on all objects near Earth. The Earth pulls on all objects with a force of gravity downward toward the center of the Earth.

## What is the SI unit of g and its value?

In the S.I. system the unit of G is Nm2kg-2. The value of the gravitational constant in SI unit is G=6.67×10−11(Newton)(m)(kg). So, the value of the gravitational constant in SI unit is G=6.7×10−8(Dyne)(cm)(g).

## Why do we fall ill?

Infectious diseases are caused by pathogens such as bacteria, viruses, fungi and parasites entering the body through the air we breathe, the food and drink we consume or through openings in the skin, such as cuts. As an example, through cough and sneezing a person can spread the cold virus to another.

## Which force binds us to the earth?

First, gravity is the force that pulls us to the surface of the Earth, keeps the planets in orbit around the Sun and causes the formation of planets, stars and galaxies.

## What is g Speed?

For example: An acceleration of 1 g equates to a rate of change in velocity of approximately 35 kilometres per hour (22 mph) for each second that elapses.

## What are the 3 equations of gravitation?

- Vout = -GM / r.
- Vsurface = -GM / R.
- Vin = -GM / R.
- g = GM / R²
- ginside ≈ g.
- (1−h)/r.
- (1−h)/r.
- goutside ≈ g.

## What is gravity caused by?

Earth’s gravity comes from all its mass. All its mass makes a combined gravitational pull on all the mass in your body.

## What is thrust and pressure?

Thrust: The force acting on an object perpendicular to the surface is called thrust. Its SI unit is Newton(N). Pressure: It is the thrust exerted per unit area of a body. Its SI unit is Pascal (Pa).

## What is inertia class9?

The tendency of a body to oppose any change in its state of rest or of uniform motion is called inertia.

## What is K value?

Substituting the values, we get. The value of K in free space is 9 × 109. Was this answer helpful?

## What is the unit used for gravity?

In SI units this acceleration is expressed in metres per second squared (in symbols, m/s2 or m·s−2) or equivalently in newtons per kilogram (N/kg or N·kg−1).

## What is small G?

Small g is used to represent the acceleration due to the gravity of any object. This is generally used for massive objects as tiny objects have very little gravitational force. Small g can be defined as the rate of change in velocity due to the gravitational force.

## What is Ke formula?

Kinetic energy is directly proportional to the mass of the object and to the square of its velocity: K.E. = 1/2 m v2. If the mass has units of kilograms and the velocity of meters per second, the kinetic energy has units of kilograms-meters squared per second squared.

## What is the mass formula?

One way to calculate mass: Mass = volume × density. Weight is the measure of the gravitational force acting on a mass.

## What is true gravity?

On Earth all bodies have a weight, or downward force of gravity, proportional to their mass, which Earth’s mass exerts on them. Gravity is measured by the acceleration that it gives to freely falling objects. At Earth’s surface the acceleration of gravity is about 9.8 metres (32 feet) per second per second.

## What is the dimension of g?

Or, G = [M1 L1 T-2] × [L]2 × [M]-2 = [M-1 L3 T-2]. Therefore, the gravitational constant is dimensionally represented as M-1 L3 T-2.

## What is the SI unit of g F?

Newton’s law of universal gravitation is represented by. F=r2GMm. where F is the magnitude of the gravitational force exerted by one object on another, M and m are the masses of the objects, and r is a distance. Force has the SI units kg. m/s2.

## Why g is called universal gravitational?

Universal gravitational constant, G is independent of the nature of the particle, medium between the particles, and time. Its value is constant anywhere in the Universe, and hence it’s called ‘Universal’.

## What is vaccination Class 9?

Vaccination is the injection of a dead or weakened organism that forms immunity against that organism in the body. Immunization is the process by which an animal or a person stays protected from diseases.

## What does disease look like?

Note: Disease can be viewed by examining symptoms of disease. The common symptoms of diseases include headache, fever, vomiting etc. Like jaundice can be examined by pale skin. Diarrhoea can be examined by loose motions.