# Gravity, Weight, and Mass: - PowerPoint PPT Presentation

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Gravity, Weight, and Mass:. What does this have to do with you?. Gravity. A force that pulls us and everything else toward Earth Every object in the universe has gravity Why? So we do not float into space. Mass. The amount of “stuff” (matter) in an object Mass does not change. Weight.

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Gravity, Weight, and Mass:

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## Gravity, Weight, and Mass:

What does this have to do with you?

### Gravity

• A force that pulls us and everything else toward Earth

• Every object in the universe has gravity

• Why? So we do not float into space

### Mass

• The amount of “stuff” (matter) in an object

• Mass does not change

### Weight

• Measurement of the force on an object caused by gravity

• Weight does change depending on gravity

### How does this all relate?

• Well, you or something else will weigh less or more depending on where you are in our solar system.

• The more mass an object has, the more it weighs because of the more gravity required to pull it down.

• On Jupiter, for example, you will weigh more. Jupiter has more mass than Earth; therefore, more gravity is needed.

### Cont.

• On the moon, you would weigh less because the moon has less mass.

• In fact, the moon’s gravity is 1/6 of Earth’s.

### Cont.

• Your weight would change at these times. However, your mass would remain the same.

• You would not suddenly be fatter or skinnier. The “stuff” that makes you up (matter) would be the same.

### On Jupiter, I would weigh about 270 pounds (lbs.)

I would not be fatter, but I would weigh more because Jupiter has more mass than Earth and more gravity is needed.

### On the moon, I would weigh about 20 lbs.

I would not be skinnier. Less gravity would be needed because the moon has less mass than Earth.

## Moon: 1/6 Earth’s Gravity

On Earth, I weighed 115 pounds. My weight on the moon was about 20 pounds. Is this 1/6 of my weight on Earth? How do you know?

Now you will use your weight (pretend) to determine your weight on the moon and other planets.