Gravity

What is Gravity?

• Gravity is a force that attracts all objects toward each other

Law of Univeral Gravitation

• States that every other object in the universe attracts every other object 
• Some factors of gravity are...
• the mass of objects 
• the distance between objects

Variables in gravity

• Gravity attracts objects, so some variables would be
• mass, because the greater the mass, the greater the force
• distance, because the greater the distance, the less force there is

Newton's 1st law of motion

• an object at rest will stay at rest
• an object in motion will stay in motion
• unless acted upon by an unbalanced force

Gravity + Inertia: role in orbit

• Inertia- the tendency to resist a change in motion 
• Gravity pulls the objects toward the sun, since it has the greatest mass
• It also keeps objects from moving in a straight line
• Inertia keeps the objects moving forward so they do not fall to the sun

Diagram of Gravity + Inertia causing Orbit