3/12/10

Magnetism & Static Electricity

Today’s Agenda Warm-Up: BrainPop: Magnetism & Static Electricity Classwork: –STEP 2 – Switch for EFP Review –Check Textbook Assignment –Write Key Question 14 & 15 Homework: –EFP Step 2 Due Monday –Key Questions Due 3/26 Conclusion: –How are electricity and magnetism related?

Student Objective Tuesday, December 22, 2015 Students will be able to… Compare and Contrast Static Electricity and Magnetism.

SWITCHES

Name: _______________ Date: _______________ Class: _______________ READ PAGES TO ANSWER QUESTIONS What part of an atom spins to produce a magnetic field? ELECTRON 2.Why are most materials not magnetic? NORMALLY ELECTRONS FORM PAIRS THAT SPIN IN OPPOSITE DIRECTIONS CANCELLING OUT THE MAGNETIC FIELDS LEAVING THE MATERIAL UNMAGNATIZED. 3.How do the domain arrangements of magnetized and not magnetized materials compare? MAGNATIZED MATERIALS HAVE DOMAINS THAT ARE ALLIGNED AND FACING THE SAME DIRECTION, WHILE MATERIALS THAT AREN’T MAGNATIZED HAVE DOMAINS THAT FACE IN MANY RANDOM DIRECTIONS AND CANCEL EACH OTHER OUT. 4.What are some common ferromagnetic materials found in nature? IRON, NICKEL, COBALT, GONDOLINIUM, NEODYMIUIM, AND SAMARIUM ARE SOME COMMON FERROMAGNETIC MATERIALS FOUND IN NATURE. 5.How can you make a temporary magnet from a paperclip? BY RUBBING IN ONE DIRCTION WITH ONE POLE OF A MAGNET YOU CAN MAKE A TEMPORARY MAGNET FROM A PAPER CLIP. THIS CAUSES THE DOMAINS IN THE IRON PAPERCLIP TO LINE UP WITH THE POLES OF THE MAGNET CAUSING THE CLIP TO BECOME MAGNATIZED. 6.What are two different ways to destroy a magnet? MAGNETS CAN BE DESTROYED BY DROPPING/HITTING OR HEATING. 7.What happens if you break a magnet in half? WHEN A MAGNET IS CUT OR BROKEN IN HALF IT BECOMES 2 SMALLER MAGNETS. EACH MAGNET WILL HAVE A NORTH AND SOUTH POLE ON ITS ENDS. READ “ELECTRIC CHARGE” (PAGE 35) TO ANSWER QUESTIONS Charges that are the same REPEL each other. 9.Charges that are different ATTRACT each other. 10.What is the one important difference between electric charges and magnetic poles? ELECTRIC CHARGES CAN EXIST ALONE (A BUILD-UP OF POSITIVE OR NEGATIVE CHARGE), BUT MAGNETIC POLES ARE ALWAYS IN PAIRS (NORTH AND SOUTH TOGETHER).

READ “STATIC ELCTRICITY” (PAGE 37) TO ANSWER QUESTIONS 11 & What is static electricity? STATIC ELECTRICITY IS THE BUILD-UP OF CHARGES ON AN OBJECT. 12.What does static mean? STATIC MEANS “NOT MOVING OR CHANGING”. READ “TRANSFERRING CHARGE” (PAGES 38 & 39) TO ANSWER QUESTIONS Charging by FRICTION is the transfer of electrons from one uncharged object to another by RUBBING. 14.Charging by CONDUCTION is the transfer of electrons from a charged object to another by direct CONTACT. 15.Charging by INDUCTION is the transfer of electrons to one part of an object that is caused by the electric FIELD of a second object. READ “STATIC DISCHARGE” (PAGES 40 & 41) TO ANSWER QUESTIONS 16 & What happens when negatively and positively charged objects are brought near each other? WHEN OPPOSITELY CHARGED OBJECTS ARE BROUGHT NEAR EACH OTHER ELECTRONS TRANSFER UNTIL BOTH OBJECTS HAVE THE SAME CHARGE. 17.The tiny spark you see when touching a doorknob and lightning are both examples of STATIC DISCHARGE.

KEY QUESTION 14: What is magnetism? Define magnetism, magnetic poles, and magnetic fields. Match the terms below with their definition. MagnetismEnds of a magnetic object where the magnetic force is strongest PolesRegions inside all objects that when lined up create a magnet. FieldsForce of attraction or repulsion among magnetic materials DomainsInvisible region around a magnet where magnetic force is exerted Describe how magnets behave when brought near each other. Would the magnets below attract or repel? Describe how an object can be magnetized. What can you do to create a temporary magnet out of a paperclip? ____________________________________________________________________________________

KEY QUESTION 15: What is static electricity? Define static electricity. Static electricity is… Identify 2 types of electric charge and describe how they interact with each other. Draw arrows to represent the motion of the balls in the picture given the charges indicated. Give examples of times when you may experience static electricity or how it can be useful. When have you felt or witnessed a static discharge? Identify at least 3 instances of static electricity in use during real life.

None This Week!

HOMEWORK Project Step 2: Due MONDAY! Key Questions Due Friday, March 26 th (typed!) Always copy daily homework into your agenda.

One difference between static electricity and magnetism is that charges can exist by themselves and magnetic poles always occur in pairs. ??? A.TRUE B.FALSE