1. Gravity

2. All matter is affected by gravity
Gravity – a force of attraction between objects that is due to their masses
All matter has mass, gravity is a result of mass, therefore all matter experiences gravity

3. Earth's Gravitational Force is Large
Earth is so massive, it's gravity is very large
You must constantly apply forces to overcome Earth's gravitational force

5. The Law of Universal Gravitation
“Why do objects fall toward Earth?”
“What keeps the planets in motion in the sky?”
Sir Isaac Newton ( )
The law describes the relationships between gravitational force, mass, and distance. It applies to all objects in the universe

6. The Law of Universal Gravitation
All objects in the universe attract each other through gravitational force.

7. Gravitational force increases as mass increases
Part 1 of the Law
Gravitational force increases as mass increases

8. Part 2 of the Law Gravitational force decreases as distance increases
The further away you are from an object, the less gravity you feel

9. Weight is a measure of gravitational force
Weight and mass are different
Mass – amount of matter in an object, and value does not change
Weight– measure of gravitational force exerted on an object, value can change depending on location in the universe.
Mass and weight are constant on Earth, so the terms are often used to mean the same thing! BE CAREFUL

11. Weight on Other Planets
Multiply your Earth weight by:
Your "new" weight
Mercury
0.4
Venus
0.9
Earth 1
Moon
0.17
Mars
Jupiter
2.5
Saturn
1.1
Uranus
0.8
Neptune
1.2
Pluto
0.01
Sun 28