Drill #20 Quote: The difference between school and life? In school, you're taught a lesson and then given a test. In life, you're given a test that teaches.

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Presentation transcript:

Drill #20 Quote: The difference between school and life? In school, you're taught a lesson and then given a test. In life, you're given a test that teaches you a lesson. ~Tom Bodett Objective: 1 st semester Reflection General Housekeeping 2 nd Semester Expectations Introduction to Electrostatics (independent reading) (lecture and notes)

What is the net force acting on a 90.0 kg race- car driver while the race car is accelerating from 0 to 44.7 m/s in 4.50 s? What is the net force acting on a 90.0 kg race- car driver while the race car is accelerating from 0 to 44.7 m/s in 4.50 s? A 9.8 N A 9.8 N B 20 N B 20 N C 201 N C 201 N D 894 N D 894 N force force F=ma m= 90.0 kg 90.0 kg a= ____ F= ? We need to know “a”, to get our answer. Let’s find another equation. a=v f -v i  t a=44.7m/s-0m/s 4.50 s 9.9 m/s 2 D 894 N 0 to 44.7m/s in 4.50 s? Warm-up:

Electric Charge and Electric Force

What is an Electric Charge? Protons have positive (+) electric charge Electrons have negative (-) electric charge.

What is an Electric Charge? Atoms become charged by gaining or losing electrons. Static electricity —the accumulation of excess electric charges on an object.

Calculating Charge Electric charge was quantified by Robert Millikan in Battery On Atomizer - charge

Millikan discovered that all the oil droplets had a charge of 1.60 x Coulombs (C) or multiples of this charge. Electron = x C Proton = x C Neutron = 0 C Calculating Charge

Charged Objects Electrically charged objects obey the following rules: - Law of conservation of charge- charges may be transferred, but they cannot be created or destroyed. –Opposite charges attract, and like charges repel

Charged objects How are these charges able to move towards or away from each other?How are these charges able to move towards or away from each other? Electrical force: force that is exerted by + and – charges on one another. Like gravity, electrical force is a “field force” – force without physical contactLike gravity, electrical force is a “field force” – force without physical contact Objects placed close together will experience a greater force – Coulomb’s LawObjects placed close together will experience a greater force – Coulomb’s Law

Charged objects Coulomb’s Law F electric = K c [(q 1 q 2 )/r²] Kc = Coulomb constant = 8.99 x 10 9 N m²/C² q = charge r = distance between the two charges

Transferring Electric Charge Charging by contact –The process of transferring charge by touching or rubbing Example: static electricity from your feet rubbing the carpet –Works best on non-conductive materials.

Transferring Electric Charge Charging by induction –The rearrangement of electrons on a neutral object caused by a nearby charged object. Occurs in conductors! Charged Object Conductor

Transferring Electric Charge Charging by Polarization –Same concept as induction, but in insulators! –The rearrangement of electrons on a neutral object caused by a nearby charged object Charged Object ---- Insulator = + = - = neutral

Transferring Electric Charge Static discharge –A transfer of charge through the air between two objects because of a buildup of static electricity. Example: lightning Grounding—using a conductor to direct an electric charge into the ground.