# ELECTROSTATICS TAPE LAB TAPE LAB PT 1 MAKE

• Slides: 27

ELECTROSTATICS - TAPE LAB

TAPE LAB (PT. 1) • MAKE A TAPE “FLAG” • MAKE A TOP (T 1) AND BOTTOM (B 1) TAPE SANDWICH • MAKE ANOTHER PAIR OF TOP AND BOTTOM TAPES Directions (T 2 & B 2) 1. 2. 3. 4. Hang T 1 and B 1 off the end of the table. (see figure below) Bring T 2 near T 1, note what happens. Bring B 2 near T 1, note what happens. Rip off a strip of paper, bring it near T 1 & B 1, note what happens. Layer tapes like so… T 1 B 1

TAPE LAB (PT. 2) • REMOVE OLD FLAGS FROM THE TABLE • MAKE A TOP (T 1), MIDDLE (M 1), AND BOTTOM (B 1) TAPE SANDWICH • MAKE ANOTHER SET OF TOP, MIDDLE, AND BOTTOM TAPES (T 2, Directions 1. Hang T 1, M 1, and B 1 off the end of the table. (see figure M 2, & B 2) Layer tapes like so… below) 2. Bring T 2, M 2, and B 2 close to each, note what happens. 3. Bring a strip of paper close to each, note what happens. 4. Answer questions at the bottom with your group. M 1 T 1 B 1

a) PROTONS QUESTIONS b) NEUTRONS c) ELECTRONS d) PROTONS & ELECTRONS e) ALL f) NONE Q 1: Which particles in the atom are charged? Q 2 : Electricity is due to the movement of which particle?

TAPE BEHAVIOR ATTRACT __________ CHARGES REPEL __________ CHARGES DO NOTHING __________

WHAT IS A CHARGE? • AN IMBALANCE OF POSITIVE AND NEGATIVE CHARGES E-EXCESS = E-DEFICIENCY = E- IN BALANCE =

DIFFERENT METHODS OF CHARGING 1. FRICTION a) RUBBING 2 OBJECTS TOGETHER. b) ELECTRONS MOVE FROM ONE OBJECT TO ANOTHER c) OBJECTS GET OPPOSITE CHARGES 2. CONDUCTION a) TOUCHING A CHARGED OBJECT TO A NEUTRAL ONE. b) OBJECTS GET THE SAME CHARGE.

DIFFERENT METHODS OF CHARGING CONT… 3. POLARIZATION a) WHEN CHARGED IS BROUGHT CLOSE TO (BUT NOT TOUCHING!) NEUTRAL. 4. GROUNDING a) **ADD TO NOTES** THE REMOVAL OF CHARGE FROM AN OBJECT

CHARGING BY FRICTION (DETAILS) • ONE OBJECT ALWAYS POSITIVE. • WHILE THE OTHER OBJECT ALWAYS NEGATIVE.

CHARGING BY CONDUCTION • NEED TWO CONDUCTORS • WHEN YOU GET ZAPPED BY A DOORKNOB, THIS IS CALLED CHARGING BY LIGHTNING.

CHARGING BY POLARIZATION

SCIENTIFIC NOTATION • + EXPONENT: LARGE # • - EXPONENT: SMALL # EX 1) 8. 5 X 106 * 9. 9 X 105 = _________ EX 2) 6. 85 X 105 * 2. 50 X 10 -6 = _________

CALCULATING CHARGE • THE UNIT OF CHARGE (Q) IS THE COULOMB. • FORMULA: • EX 3) AN OBJECT HAS 1 X 1021 ELECTRONS TAKEN AWAY FROM IT. WHAT IS THE CHARGE?

CALCULATING CHARGE • THE UNIT OF CHARGE (Q) IS THE COULOMB. • FORMULA: • EX 4) AN OBJECT HAS AN EXCESS OF 5 X 1020 ELECTRONS. WHAT IS THE CHARGE ON IT?

CONDUCTING SPHERES • TAKE THE MATH AVERAGE: EX 5) WHAT CHARGE RESULTS FROM THESE SPHERES BEING TOUCHED? +3 C , -1 C +10 C , -12 C +6 C , -6 C 0 C , +8 C 0 C , 0 C

SHOCKING AND ELECTRIC FIELDS GETTING SHOCKED: • THERE WILL ONLY BE A SHOCK IF THERE IS A DIFFERENCE IN CHARGE. ELECTRIC FIELDS: • EVERYTHING THAT HAS A CHARGE HAS AN ELECTRIC FIELD AROUND IT. ELECTRIC FIELD DIAGRAMS: • CHARGES ARE DRAWN OUT OF THE POSITIVE AND INTO THE

CURRENT BUT…ELECTRICITY DOESN’T FLOW THROUGH ALL OBJECTS EQUALLY! HOW DIFFICULT IT IS TO GET ELECTRICITY TO FLOW THROUGH SOMETHING = ______________________________ • CONDUCTOR – • INSULATOR –

EXAMPLE • EXAMPLE: 9 V BATTERY • ON FINGER ON TONGUE

HOW DOES LIGHTNING WORK? • ELECTRICITY LIKES TO JUMP INTO THINGS THAT ARE: 1. METALS (CONDUCTORS) 2. TALLEST POINT 3. POINTY SHAPE THAT’S WHY LIGHTNING RODS ARE PLACED ON THE HIGHEST POINT OF A BUILDING & GROUNDED.

BUT REALLY, HOW DOES LIGHTNING WORK? 1. CLOUD : CHARGED BY FRICTION (-) 3. LIGHTNING BOLT: EVENING OUT THE CHARGE 2. EARTH’S SURFACE GETS POLARIZED

LIGHTNING SAFETY • HOW MANY PEOPLE DIE IN THE USA YEARLY FROM LIGHTNING STRIKES?

LOOK AT THE STATS. LIGHTNING'S NO JOKE.

DON’T HIDE UNDER A TREE. . . • LIQUID WATER BECOMES SUPER-HEATED STEAM… • TREE EXPLODES.

IT’S SAFE IN YOUR HOUSE. . . JUST • DON’T BECOME PART OF THE HOUSE CIRCUIT… DON’T • USE A CORDED DEVICE • SHOWER/BATHE • STAY AWAY FROM WINDOWS AND DOORS

ALSO SAFE IN YOUR CAR… • NOT DUE TO THE RUBBER TIRES! • INSIDE A HOLLOW METAL SHELL, NO ELECTRICITY FLOWS. (FARADAY CAGE)