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Do Now (Homework was due yesterday) How much charge can a 20F capacitor hold with a potential difference of 5V?

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Presentation on theme: "Do Now (Homework was due yesterday) How much charge can a 20F capacitor hold with a potential difference of 5V?"— Presentation transcript:

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2 Do Now (Homework was due yesterday) How much charge can a 20F capacitor hold with a potential difference of 5V?

3 Two charges 4. 0 C and 3. 0 C are separated by 6m
Two charges 4.0 C and 3.0 C are separated by 6m. What is the force between them?

4 Coulomb’s law vs. Universal law of gravitation
Both look similar, but they also have differences You are expected to be able to identify the similarities and differences between the two!!!

5 Let us start with similarities
Both involve 2 objects or charges Both follow the inverse square law with distance Both measure a force

6 Let us look at the differences
Gravity is ONLY a force of attraction. Coulomb’s can be attraction OR repulsion Coulomb’s law works ONLY on charged objects. Gravity works for both charged and neutral objects One of them is stronger than the other (which one is it? Coulomb’s force or gravity?)

7 Imagine a 1kg object with +1C charge placed 1m away from another 1kg object with +1C charge. Calculate both Fg and Fe to compare

8 Imagine a 1kg object with +1C charge placed 1m away from another 1kg object with +1C charge. Calculate both Fg and Fe to compare Coulomb’s force Gravity N N

9 Both involve 2 objects or charges
Coulomb’s Law Universal gravitational law Coulomb’s can be attraction OR repulsion Coulomb’s law works ONLY on charged objects Coulomb’s force is stronger Coulomb’s force is NOT universal Gravity is ONLY a force of attraction Gravity works for both charged and neutral objects Gravity is weaker Gravity is universal Both involve 2 objects or charges Both follow the inverse square law with distance Both measure a force

10 Two objects are 4m apart and exert a gravitational force of 80N on each other. If one object has a mass of 5 x 104kg, what is the mass of the second object?

11 A 9. 0 C charge and a 14. 0 C have a force of repulsion of 300N
A 9.0 C charge and a 14.0 C have a force of repulsion of 300N. How far apart are they?

12 Work on your own!!! You can refer your own notes. Do not look into your neighbor’s paper though No talking or communicating to your neighbor in any form

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