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AP Physics 2

AP Physics 2. Ch 15 Review. Terms to Remember. Electrostatics – study of charges at rest Electroscope – device that detects the presence of charge by diverging leaves. Terms to Remember. Conductor – material that allows charge to flow easily - large number of free electrons

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AP Physics 2

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  1. AP Physics 2 Ch 15 Review

  2. Terms to Remember • Electrostatics – study of charges at rest • Electroscope – device that detects the presence of charge by diverging leaves

  3. Terms to Remember • Conductor – material that allows charge to flow easily - large number of free electrons • Free electron – outer electrons attached so weakly it can drift throughout the material belonging to no atom in particular

  4. Terms to Remember • Insulator – material that doesn’t allow charge to flow freely

  5. Ways to Charge an Object • Charging by friction – pull electrons away from one object and transfer to another by rubbing the objects together • Charging by contact – process of giving an object charge by placing it in contact with a charged object

  6. Ways to Charge an Object • Charging by induction – process of giving an object a charge due to the presence of a charged object

  7. Charge • Basic unit of charge = charge of electron • It takes 6.24 x 1018 electrons to make 1 Coulomb e- = -1.6 x 10-19 C p+ = +1.6 x 10-19 C

  8. Charge Mass of e- = 9.11 x 10-31 kg Mass of p+ = 1.673 x 10-27 kg Mass of n = 1.675 x 10-27 kg

  9. Coulomb’s Law • Force between any 2 point charges is proportional to the magnitudes of the charges and inversely proportional to the square of the distance between them

  10. Coulomb’s Law F = k q1 q2 r2 k = 8.99 x 109 Nm2/C2 q1 and q2 = magnitude of charges r = distance between charges

  11. Sample Problem Donna and John have masses of 50 kg and 80 kg respectively. • How many protons are there in each person? (Protons make up roughly 55% of the mass of the human body.) • Suppose John and Donna stand 5 m apart. Calculate the force exerted on John’s protons by Donna’s protons.

  12. Sample Problem Hanging from threads are two charged balls made of pith. The balls each have a mass of 0.1 g and a charge of the same magnitude q and are attracted to each other. (a) What is the magnitude of the electric force? (b) What is the magnitude of q? (c) How many electrons have been transferred to or from each ball?

  13. Sample Problem An electron is near a positive ion of charge +9e and a negative ion of charge -8e. (a) Find the magnitude and direction of the resultant force on the electron. (b) Find the magnitude and direction of the electron’s instantaneous acceleration.

  14. Sample Problem Given two point charges q1 and q2 = 4q1, find the position of a third charge q3 relative to the other two charges, such that the resultant force on q3 is zero.

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