Gravity and force vectors

Question 1

Law of universal gravitation

Answer 1

Every body attracts every other body with a force that, for any two bodies, is directly proportional to the product of their masses and inversely proportional to the square of the distance separating them

Force = (mass 1 x mass 2) / distance^2

Question 2

Universal gravitational constant

Answer 2

G
- the proportionality form of the universal law of gravitation can be expressed as an exact equation when the constant G is introduced

F = G [(m1m2) / d^2]

Question 3

G

Answer 3

Identical to the magnitude of the force between a pair of 1kg masses that are 1 meter apart

G = 6.67 x 10 - 11 N x m^2 / kg^2

Question 4

G facts

Answer 4

• the value of G is very weak
• the force of attraction between you and the earth can be measured (your weight)
• you weight depends on your distance form the center of the earth (further away = lees weight)

Question 5

Inverse-square law

Answer 5

Relates the intensity of an effort to the inverse square of the distance from the cause

Intensity ~ 1/d^2

• gravity follows this law.
• gravitational force approaches zero the further away from th earth you get, but it never reaches zero