| Term | Definition |
|---|
| The moon has less gravity than Earth. | Why do astronauts on the moon bounce when they walk? |
| Gravity | What is the force of attraction between two objects that is due to there masses? |
| By changing it's speed, direction ,or both. | How can the force of gravity change the motion of an object? |
| Everything has a mass and gravity is a result of mass. | Why is all matter affected by gravity? |
| Gravity | What is the force that pulls you toward your pencil? |
| The objects are too small to cause a force large enough to move objects towards eachother. | Why can't you see objects moving toward eachother? |
| Every object is pulled toward the center of the Earth. | How are objects around you affected by the mass of Earth? |
| Why do objects fall toward Earth? and What keeps the planets moving in the sky? | What were the 2 questions that Sir Isaac Newton realized were actually two parts of the same question? |
| It's their nature- They're heavy (kingdom of man- imperfect- original sin) | What was the idea people had before 1720 on why an apple fell towards Earth's ground? |
| God is in control of them (Kingdom of heaven- perfect) | What was the idea people had before 1720 on why the planets move in the sky? |
| It's the same force acting on a different scale (different size) | How would you describe the force acting on the apple and the planets? |
| The law of universal gravitation. | Newton summarized his ideas about gravity in a law called what? |
| That all objects in the universe attract eachother through gravitational force. | What does the law of universal gravitaion state? |
| Mass and distance | What are the two variables that gravitational force depends on? |
| Small objects have less gravitational force than objects with large mass. | How does the gravitational force between objects with small mass compare to objects with large mass. |
| Even though the sun has more mass then the Earth, it's far enough away that it doesn't have as much effect on you. | Why doesn't the sun's gravitational force affect you more than Earth's gravitational force? |
| When the objects are closer the gravitational force increases and when they're further way it decreases. | What happens to the gravitational force when the distance between the objects changes? |
| Weight | What is the measure of gravitational force on an object? |
| Mass | What is the measure of the amount of matter in an object? |
| It's mass stays the same and it's weight will increase. | If an object is moved from Earth to a place with greater gravitational force What happens to it's weight and mass? |
| On Earth, mass and weight are constant. | On Earth why are the words mass and weight used to mean the same thing? |
| A newton (N) | What's the SI unit for force? |
| Weight is a measure of gravity and gravity is a force. | Why is weight measured in newtons? |
| The kilogram (kg) | What's the main SI unit of mass? |
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