Motion, Forces & Newton’s
Chemistry, Reactions & Matter
Earth, Space & Astronomy
Energy, Heat & Thermal Processes
Ecology, Energy Flow & Environmental Science
100

A force that causes an object’s motion to change.

What is an unbalanced force?

100

Substances made of only one type of atom.

What are elements?

100

The spinning of Earth on its axis, causing day and night.

What is rotation? 

100

Heat transfer by direct contact between particles.

What is conduction?

100

Factors in an ecosystem that are nonliving, such as water and sunlight.

What are abiotic factors?

200

This law states an object in motion stays in motion unless acted on by an outside force.

What is Newton's First Law?

200

When new substances with new properties form.

What is a chemical change? 

200

The path Earth takes around the Sun, causing seasons.

What is revolution?

200

Heat transfer in fluids where warm material rises and cool sinks.

What is convection?

200

A relationship in which organisms struggle for the same limited resource.

What is competition?

300

The product of mass and acceleration.

What is net force? 

300

The principle that atoms cannot be created or destroyed during a reaction.

What is the Law of Conservation of Mass?

300

A diagram that classifies stars by temperature and luminosity.

What is the HR Diagram

300

Heat transfer through electromagnetic waves.

What is radiation?

300

The base of all food chains that captures energy from the Sun.

What are producers?

400

The graphical representation showing constant speed as a straight diagonal line.

What is a distance–time graph?

400

A reaction where the mass of reactants equals the mass of products.

What is a balanced chemical equation?

400

The two forces that keep planets in orbit.

What are gravity and inertia?

400

The condition where heat no longer flows because temperatures are equal.

What is thermal equilibrium?

400

A process where ecosystems recover after a disturbance.

What is secondary succession? 

500

When equal and opposite forces act on an object, resulting in no movement change.

What are balanced forces?

500

A combination of two or more elements chemically bonded together.

What is a compound? 

500

Galaxy type shaped like a flattened disk with spiral arms.

What is a spiral galaxy?

500

The quantity calculated by dividing mass by volume.

What is density?

500

An inherited trait that increases an organism's chance of survival.

What is adaptation? 

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