Lecture 21b

# Lecture 21b - Chapter 21(continued Work on Worksheet 21a...

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Chapter 21 (continued) Work on Worksheet 21a for the first 5 mins of class Work with a partner Read the instructions and questions carefully. Discuss the concepts and your answers with one another. Take time to understand it now!!!! Come to a consensus answer you both agree on. If you get stuck, or are not sure of your answer, ask another group. If you're still stuck, raise your hand, and I'll help.

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Direction: like charges repel, opposites attract Force vectors on a diagram Coulomb’s law: 2 charges exert a force on each other 2 2 2 1 r Q Q k F Q 1 Q 2 r magnitude F 12 F 21 2 ]
3 Class Question 1 Consider the following three situations, labeled 1, 2 and 3 +Q +Q +Q +q +3q +5q r 2r 2r 1 2 3 In which situation is the repulsive force strongest? A) 1 B) 2 C) 3 D) two of the situations tie for the largest size force. 2 2 1 r Q Q k F

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Electric force Gravitational force Consider 2 protons in an iron atom. Separated by distance 4 x 10 -15 m. Which force is stronger?
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Lecture 21b - Chapter 21(continued Work on Worksheet 21a...

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