# Why The Velocity Of A Satellite Changes As It Orbits The Earth?

Gravitational attraction provides the centripetal force needed to keep a planet in orbit around the Sun, and a satellite in orbit around a planet.

An object moving in a circular orbit at a constant speed has a changing velocity.

This is because velocity is a vector quantity that depends on speed and direction.

## How do satellites get their velocity?

Most satellites are launched into space on rockets. A satellite orbits Earth when its speed is balanced by the pull of Earth’s gravity.

## How does velocity affect orbit?

A planet’s orbital speed changes, depending on how far it is from the Sun. The closer a planet is to the Sun, the stronger the Sun’s gravitational pull on it, and the faster the planet moves. The farther it is from the Sun, the weaker the Sun’s gravitational pull, and the slower it moves in its orbit.

## Does a satellite orbiting the Earth have a constant velocity?

For this reason, there is no acceleration in the tangential direction and the satellite remains in circular motion at a constant speed. A satellite orbiting the earth in elliptical motion will experience a component of force in the same or the opposite direction as its motion.

## What happens to a satellite if its speed changes?

A satellite that is going very fast will keep going forward very fast, because of inertia. If a satellite is going very fast, it can go forward so quickly that the pull of gravity can’t keep it in an orbit. Changing speed is one way to change the orbit of a satellite or make a satellite leave orbit.

## What is the orbital velocity of a satellite?

Orbital velocity is the velocity needed to achieve balance between gravity’s pull on the satellite and the inertia of the satellite’s motion — the satellite’s tendency to keep going. This is approximately 17,000 mph (27,359 kph) at an altitude of 150 miles (242 kilometers).

## What are 3 uses of satellites?

The uses of Artificial satellites are:

• They are used for communication purpose.
• Carry instrument or passengers to perform experiments in space.
• For Weather Forecasting System.
• For GPS (Global Positioning System)

## How does a satellite maintain its orbit?

The initial speed of the satellite maintained as it detaches from the launch vehicle is enough to keep a satellite on orbit for hundreds of years. A satellite maintains its orbit by balancing two factors: its velocity (the speed it takes to travel in a straight line) and the gravitational pull that Earth has on it.

## What is the orbital velocity of Earth?

The Earth’s mean orbital speed, in meters per second (m/s), is obtained by dividing this number by the length of the year in seconds. This can result in either of two figures. A rough, general figure for the Earth’s mean orbital speed is 30 kilometers per second (km/s), or 18½ miles per second (mi/s).

## Why do satellites in lower orbits travel faster?

So really, a satellites ability to maintain its orbit comes down to a balance between two factors: its velocity (or the speed at which it would travel in a straight line), and the gravitational pull between the satellite and the planet it orbits. The higher the orbit, the less velocity is required.