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Gravity

A natural force which pulls objects of mass toward each other.

Heat

The driving force behind steam power and the combustion engine.

Magnetism

A force which can attract or repulse objects within its field.

Law of Inertia

A law that states that an object in motion tends to remain in motion.

Energy

This is neither created nor destroyed.

Law of Action and Reaction

For every one of these, there is an equal and opposite one of these.

Suction/Lift

A differential in pressure between air or water flowing in a curved path over the surface and the air or water moving in a straight path underneath.

Electromagnetic Waves

Known in general as rays, these span vibrating electric fields.

Elements

All matter is made up of one or more of these.

Molecules

The way these behave governs the workings of many machines.

Atoms

The building blocks of molecules...

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