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Gravity by John Mayer

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C) Universal Law of Gravity

 

 

 

 

Moon Has An Unbalanced Force On It!

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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. 

 

Weight

 

Enrichment

 

www.wpclipart.com

 

How do we measure very tiny gravitational forces?

Physics for the 21st Century


Determining G, Cavendish

Video

Penn State Physics

 

 

Dark Matter

 

 

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