Newton's third law of motion says that for every reaction, there is an equal and opposite reaction. Over 300 years ago, Isaac Newton used the laws of motion to explain the movement of many physical objects.

Rocket engines work under the principle of Newton's third law of motion. Most rocket engines turn the fuel they carry into hot gas. The engine pushes the gas out its back causing the rocket to move forward. The more fuel burned, the faster the space ship moves. A lot of fuel is needed to lift a rocket into space due to the Earth's gravity.

Many rockets are made up of multiple parts. When a part of the rocket has used up all of its fuel, it is dropped by the rocket to make it lighter. The discarded part then falls back to Earth.

What is Newton's third law of motion?

	For every reaction a space ship goes higher
	For every reaction, there is an equal and opposite reaction
	Fuel makes rockets fly
	Space ships are fun

Rocket engines work under the principle of:

	Newton's first law of motion
	Newton's second law of motion
	Newton's third law of motion
	Newton's fourth law of motion

Rocket engines turn fuel into:

	hot gas
	cold gas
	space ships
	loud sounds

What causes a space ship to move faster?

	Burning less fuel
	Burning more fuel
	Gravity
	Wings

Why is a lot of fuel needed in a rocket?

	Overcome gravity
	Space is close
	Space is far away
	Makes the space ship slower

What happens to discarded parts of rockets?

	Break into pieces
	Fall back to Earth
	Turn a different color
	Make a loud sound