1. Add info about mass vs. weight
Give example-if your mass was 55 kg on earth, it’d be 55kg on the moon.
If you weight was 55

2. Gravity: The Force of Attraction
Unit 7
Section 4

3. What is Gravity?
Gravity-a force of attraction between objects that is due to their masses.
Mass is the amount of matter (or stuff) in an object.
(Mass Always Stays Same)
This means that all objects experience gravity between them.
The bigger the objects are, the more gravity that exists between them.
1. For example-A planet has more gravity than a person.
2. In class, when we talk about gravity, we will specifically be talking about planet’s gravity, but all objects have gravity.

4. Gravity
e. On Earth, all objects fall toward the center of Earth’s mass. f. Gravity can change the motion of an object by changing its speed, direction, or both

5. Newton and Gravity
Sir Isaac Newton was a scientist who first recognized gravity when an apple fell from a tree.
Newton realized that gravity depends on 2 factors:
the mass of objects and
the distance between them.
This was called the Law of Universal Gravitation.

6. III. Law of Universal Gravitation
Gravitational force increases as mass increases.
The sun has a stronger gravitational force than our moon because it has a greater mass.
Gravitational force decreases as distance increases.
When we leave earth in a space ship, we are getting further from Earth’s gravitational pull so we won’t feel the pull of Earth’s gravity which causes us to “float” in space.
(distance increased so gravitational pull will decrease)

7. Add info about mass vs. weight
Give example-if your mass was 55 kg on earth, it’d be 55kg on the moon.
If you weight was 55

8. Weight
Weight is a measure of the gravitational force on an object. Weight is how much gravity is pulling down on an object.
Weight can change, depending on where you are in the universe and how much gravity there is.
The bigger the planet, the greater the gravity there is and you will weigh more.

9. Add in on your notes D)

10. Weight
How much do you weigh...

11. Quickie Quiz What is the amount of stuff in an object? Weight Mints
Mass
Fluff

12. Quickie Quiz As mass increases gravitational force will Decrease
Stay the same

13. Quickie Quiz On the moon, your mass will Decrease Increase
Stay the same

14. Answer These Questions
Explain the law of universal gravitation
Describe the difference between mass and weight

15. Answers
Gravity is a force of attraction between objects that is due to their masses. All objects experience gravity between them.
Gravitational force increases as mass increases. Gravitational force decreases as distance increases.
Weight can change depending on where you are in the universe and how much gravity there is, but mass always stays the same.