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C) Universal Law of Gravity
Moon Has An Unbalanced Force On It!
Gravity - mutual force of attraction between any two objects in the universe
| F = | Gm1m2 |
| (r2) |
G = Gravitational constant = 6.67 x 10-11 Nm2/kg2
(Reference Table p. 1)
m1, m2 two masses
r - distance between
center of
masses
Giancoli p. 131) 28
| F = | Gm1m2 |
| r2 |
Fg proportional to
product of two
masses
| Fg | m1 | m2 |
| 100 N | x |
y |
200 N |
2x |
y |
600 N |
2x |
3y |
400 N |
x |
4y |
150 N |
1/2x |
3y |
| F = | Gm1m2 |
|
(r2) |
Fg inversely proportional to the square of distance between the object's center of mass
| Fg | r |
x1/4 |
x2 |
x1/9 |
x3 |
x1/16 |
x4 |
x9 |
x1/3 |
x16 |
x1/4 |
Ex) If the gravitational force on satellite A is 160,000 N, what is the gravitational force on satellite B?
F = 40,000 N
(twice distance, 1/4 the force)
Fluids in Micro-Gravity
Ranking Task
Rank the gravitational forces from greatest to smallest.
Enrichment
How do we measure very tiny gravitational forces?
Determining G, Cavendish
Dark Matter
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