Drop a ball. It falls down. A force pulls it. The force is gravity. Gravity pulls things toward each other.
Earth's gravity keeps you on the ground. It makes things fall.
A dropped ball falls faster and faster as it falls.
Does a heavy thing fall faster than a light thing? With no air, they fall at the same rate.
Anything that has mass also has gravity. Things with more mass have more gravity.
Your body has mass. Earth's gravity pulls on it. That gives you weight.
Your mass stays the same on Earth. It stays the same on the Moon. Your weight changes.
The Moon has weaker gravity than Earth. On a planet with less mass than Earth, you would weigh less.
The Moon's gravity pulls on the sea. Its pull is the main cause of tides.
Gravity keeps the Moon moving around Earth. The Sun's gravity keeps Earth moving around the Sun.
Words to know
- gravity: a pulling force
- mass: amount of stuff
- weight: pull on you
- tides: sea rising, falling
