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# Mass Definition

Mass is the amount of matter in an object, constant and not affected by location. For example, an object's mass is the same on Earth and Mars.

Grades 6-8 VideoGravitational Forces Between Objects
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## Gravitational Forces Between Objects

### Fun Facts

• Mass does not change based on where you are, while weight can vary based on the pull of gravity in that area.
• The force of gravity depends on the mass of an object - the bigger the object, the stronger the force of gravity.
• Mass is measured on a balance, comparing unknown to known amounts of matter.

### Why Do We Need To Know About Mass

Learning about mass helps us understand gravity, which is important for many jobs. Astronauts need to know about mass because they work in space where there is no gravity. This helps them move around and stay safe. Construction workers use their knowledge of gravity to make sure buildings are safe and won’t fall over, especially tall ones like skyscrapers.

The way the Moon’s gravity affects the oceans’ tides is related to mass, which is important for people studying the ocean and marine life. People who study space and design spaceships, like astronomers and aerospace engineers, use what they know about mass and gravity to learn more about space and make better spacecraft. Understanding mass is key to many areas, from building and safety to exploring space and the ocean.

Explain one way gravity affects objects.
Gravity is the force that pull objects to the center of Earth.
What is an example of an object that affects gravity on Earth?
The Moon affects the tides on Earth. High tide is caused by the Moon’s gravity.
How can the force of gravity affect weight?
Gravity is not the same in all places. For example, if you were high up on a mountain, you would weigh less because the force of gravity is less.
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