1. Gravity: A Force and Motion
Chapter 5 Lesson 2
Gravity: A Force and Motion

2. Gravity
Gravity- a force of attraction between objects that is due to their masses
All matter is affected by gravity because of mass
Gravity is a result of mass
The Earth’s gravity must be overcome for an object to move

3. The Law of Universal Gravitation
Law that was designed by Sir Isaac Newton
Law of Universal Gravitation describes the relationship between gravitational force, mass, and distance
Part 1- Gravitational force increases as mass increases
Part 2- Gravitational force decreases as distance increases

4. Law of Universal Gravitation

5. Weight is a Measure of Gravitational Force
Weight- a measure of the gravitational force exerted on an object
Weight is measured in Newton (N)
Mass- the amount of matter in an object, its value does not change
Mass is the same everywhere; weight changes with location

6. What Keeps Objects in Motion
Inertia- tendency of of object to resist change in motion
Newton’s 1st Law of Motion- All objects will stay at rest or stay in motion until acted upon by an outside force
Planets orbit the sun due to 2 factors- inertia and gravity