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These three short online lessons discuss asteroids, comets and meteors.

This video explains about coefficient, constant, variable and exponents. Useful for introductions to the topic and/or extension work. 

In this unit you will learn:

• About the turning effect of forces
• Turning effects are called moments
• Understand that regular and irregular shaped objects have a centre of gravity
• An objects centre of gravity determines if it is in a stable, neutral, or unstable equilibrium

Other objects in the solar system are discussed in this online textbook viz. asteroids, meteorites, comets and dwarf planets.