Chapter 3--UNITY of CELESTIAL and TERRESTRIAL MOTIONS

Homework Solutions

Key Concepts: 



  • Gravity is an attractive (whistle..whistle) force between 
	any two things that have mass

  • The force of Gravity can be written in one simple mathematical formula

  • This formula describes the force between Earth & Apple 
	as well as Earth & Sun, hence UNITY of motions.


    • Look at this equation: 

    			F = GMm / r^2

     

    
Now the name of this course is "CONCEPTS in Physics".  Not "Formulas of physics" or
even "Facts of Physics".  What concepts can we discover by realizing that this formula
describes the force of Gravity.

Heres one--- You double the distance "r" and the force goes down by ......

Also don't forget that "r" is the distance between the CENTERS of the two objects in question.

    

    

    
Space Station--Worth $10 billion?
    

    
Speaking of spacey check out some cool pictures taken of the Aurora Borealis (Norther Lights)
by my buddy Sally Ride:
    
Pic1  
Pic2

    

    

    
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