1. Newton’s Law of Gravity

2. Standards
Know that every object exerts gravitational force on every other object, and how this force depends on the masses of the objects and the distance between them.

3. Gravity
The attractive effect that any object with mass has on all other objects with mass.
The greater the mass of the object, the stronger its gravitational pull.

4. Gravitational Force
The force exerted on one body by another due to the effect of gravity. The force is directly proportional to the masses of both bodies and inversely proportional to the square of the distance between them.

5. Written as: F = Gm1m2 r2
where, G = gravitational constant =
(6.67 x N m2/kg2)
m1 & m2 = the masses of the two objects
r = the distance between the two objects

6. Gravitational Force Thought Problem
What are two ways in which the gravitational force can be reduced between a planet and an object in orbit about it?
Decrease the mass of the object or planet, or increase the distance between them (solution: the gravitational force is directly proportional to mass and inversely proportional to distance)