1. Gravity
S8P5a. Construct an argument using evidence to support the claim that fields (i.e., magnetic fields, gravitational fields, and electric fields) exist between objects exerting forces on each other even when the objects are not in contact.

2. Gravity Well Video & Lab

3. GRAVITY – Force of Attraction
Definition of Gravity: The force of attraction between any two masses

4. Characteristics of Gravity
Gravity depends on the masses of the two objects and the displacement between them.
One of the weakest forces in the universe
Force exerted by every object in the universe on every other object

5. Law of Universal Gravitation
All objects in the universe attract each other through gravitational force. The size of the force depends on the masses of the objects and the distance between the objects.
Gravitational Force Increases as Mass Increases
Gravitational Force Decreases as Distance Increases

6. What is the relationship between mass and gravitational force?

7. The gravitational force will decrease.
Two objects of the same mass are shown below. What will happen to the gravitational force between the two if distance between them is increased?
100 kg
100 kg
The gravitational force will decrease.

8. The mass of the objects and the distance between them.
What does the magnitude of gravitational force between two objects depend on?
The mass of the objects and the distance between them.

9. Gravitational Acceleration

10. Consider the following:
Will a feather and a bowling ball fall at the same rate here on Earth? On the moon?

11. Consider the following:
Will a feather and a bowling ball fall at the same rate here on Earth?
The feather and the bowling ball will not fall at the same rate on Earth because of the friction caused by air resistance will slow the feather down.

12. Consider the following:
Will a feather and a bowling ball fall at the same rate on the moon?
The feather and the bowling ball will fall at the same time on the Moon because the moon does not have an atmosphere ...no friction (air resistance)
Bowling Ball/Feather Drop Video