Gravity is the force that pulls objects toward each other, like you to the Earth.

Light travels at about 299,792 kilometers per second, the fastest speed in the universe.

Sound needs a medium like air or water to travel; it cannot travel through a vacuum.

Energy can neither be created nor destroyed; it can only change forms (Law of Conservation of Energy).

The atom is the basic building block of matter.

Electricity is the flow of tiny particles called electrons.

Magnetism and electricity are closely related and are parts of electromagnetism.

Newton’s three laws of motion describe how objects move.

Heat always flows from a hotter object to a cooler one.

The universe is constantly expanding, meaning galaxies are moving away from each other.