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Satellites in Orbit

In this worksheet, students will explore the fact that the Earth orbits around the sun and what stops the Earth and the other planets from moving away from each other.

'Satellites in Orbit' worksheet

Key stage:  KS 3

Curriculum topic:   Physics: Motion and Forces

Curriculum subtopic:   Forces

Difficulty level:  

Worksheet Overview

When an athlete throws the hammer, the cord between the athlete's hands and the hammer stop the hammer from moving away from the athlete, until they let go of course!



Hammer thrower

A hammer thrower in action


This is similar to how the Earth travels in orbit around the Sun, with one difference: there is no cord holding the Earth in orbit; instead, it is the force of gravity.


Gravity stops the Earth and all the other planets and moons from moving from their orbits,i.e. it keeps them in orbit.



Solar system

The planets in orbit around the Sun


As can be seen in the diagram of the Solar System above, the planets close to the Sun have a more curved orbit, because the force of gravity from the Sun gets stronger the closer you get to it.


The force of gravity is also responsible for keeping the Moon orbiting around the Earth.



Earth and moon

The Moon orbiting the Earth


The force of gravity can also keep our artificial satellites in orbit around the Earth without the need for power, because gravity from the Earth holds them in position. Similar to how the planets orbit around the Sun, satellites that are close to the Earth orbit faster and on a more curved path than those that are further from the Earth.


Satellite in orbit

A satellite orbiting the Earth 

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