⚽Balls stay still until a push or pull moves them.

A push or a pull is a force.

Forces can make things go faster, slower or turn.

Pushes and pulls have a size. They have a direction too.

⚽A bigger push means a bigger change.

📦A heavy box moves less than a light box.

📦Heavy things need a bigger push than light things.

🌍Gravity pulls toward the center of Earth.

⚽A ball you drop goes down.

🛷When things slide or rub, friction slows them.

Words to know

• force: push or pull
• direction: which way
• gravity: pull toward Earth
• friction: slowing rub