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Elementary Charge The charge (q) of one electron is q = x coulomb

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Presentation on theme: "Elementary Charge The charge (q) of one electron is q = x coulomb"— Presentation transcript:

1 Elementary Charge The charge (q) of one electron is q = x coulomb The charge (q) of one proton is q = x C - +

2

3 Coulomb’s Law F is attractive if the charges are opposite
q is the charge d is the distance from center to center ke is called the Coulomb constant ke = 8.99 x 109 N.m2/C2 F is attractive if the charges are opposite F is repulsive if the charges are like + -

4 Mathematical Relationships
q1 q2 d (q1q2) d2 F 1 (1*1)/12 = 1/1 2 (2*1)/12 = 2/1 4 10

5 Mathematical Relationships
q1 q2 d (q1q2) d2 F 1 (1*1)/12 = 1/1 2 (2*1)/12 = 2/1 4 (4*1)/12 = 4/1 (1*1)/22 = 1/22 10 (1*1)/102 = 1/102 1/100 1/2 1/(1/2)2 = 1/(¼)

6 Why does k have such strange units? ke = 8.99 x 109 N.m2/C2

7 Who figured out the value of k?

8 Coulomb’s Law Charles Coulomb measured the magnitudes of electric forces between two small charged spheres He found the force depended on the charges and the distance between them

9 Force Calculations If I put two protons, 1x10-3 meter apart what would happen? What are the forces acting on them? + +

10 Compare! What is the electric force between 2 protons 1x10-3 meter apart? Charge: 1.6 x C ke = 9.0 x 109 N.m2/C2 What is the gravitational force between 2 protons 1x10-3 meter apart? Mass: 1.7 x kg G = 6.7 x N.m2/s2

11 Force Calculations What is the electric force between the same two particles? Felectric = 2.3x10-22 N What is the force gravity between two protons one meter apart? Fgravity = 1.9x10-58 N Ratio = 1.4x1039 The electric force is over times stronger than the force of gravity!

12 Gravity verse Electricity
1,400,000,000,000,000,000,000,000,000,000,000,000,000 Thousand x million x million x million x million

13 6 words or less, accurate and connected to science
Coulomb’s Law Newton’s Law 6 words or less, accurate and connected to science Venn Diagram Competition A+ = 2 unique contribution C = 1 unique contribution D- = 0 unique, but you tried F- - = you sorta tried, but really were more focused on texting and checking how many friends you have on Facebook.

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15 Homework: Research the INVERSE SQUARE LAW
Write a 1 page report on the ISL Report should include Text Graph picture/diagram 3 examples of concepts that obey the ISL 1 text resource 1 video resource APA formatted references

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