1. What is Matter
- What do water, a rock, and a dog have in common?
- They are all made of matter
- Vocabulary: Matter Anything that takes up space and has mass
- You are made of matter.
- Everything you see or touch is matter
- The whole world around you is made of matter
- Since matter is anything that takes up space and has mass
- What is mass?
- Vocabulary: Mass A measure of how much matter an object has
- For example: A mountain takes up space and has mass
- A rock takes up space and has mass
- A mountain has more mass than a rock because a mountain is made of rocks but they both have matter
- A kitten has less mass than a tiger but they are both matter.
- On Earth, mass seems about the same as weight.
- But in space we can see they are different
- Astronauts have the same mass on Earth and in space.
- In space, the pull of gravity is so little that they float in their spacecraft.
- Weight is the pull of gravity upon a body or object
- Vocabulary: Gravity A force that attracts, or pulls on matter
- Gravity is a force
- The gravity of Earth pulls on all matter near Earth
- Gravity pulls matter toward the ground
- Gravity is why anything you drop falls to the ground
- Without gravity, you would float in the air!
- Gravity is strongest at the center of Earth
- Far from the center, at the top of a mountain, gravity is weaker.
- Suppose you were in a deep hole in
- Gravity would be strong. It would pull strong on you.
- So you would weigh more than you would weigh on top of a mountain.
- Further from Earth’s center, gravity does not pull as hard.
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