Warm Up n When a car is moved

Warm Up n When a car is moved into a painting chamber, a mist of paint is sprayed around it. When the body of the car is given a sudden electric charge and the mist of paint is attracted to it, presto – the car is quickly and uniformly painted. What does the phenomenon of polarization have to do with this?

Electrostatics Jeopardy Charge Atoms Transfer Equilibrium $100 $200 $300 $400 $500

1 - $100 n How do protons and electrons differ in their electric charge? n Protons are positive (+) and electrons are negative (-)

1 - $200 n How do like charges behave toward each other? How do unlike charges behave toward each other? n Repel, Attract

1 - $300 n Magnetic forces depend on magnetic materials. What comparable property underlies electrical forces? n Charge

1 - $400 n When you felt the electric force in the Sticky Tape Lab, what was actually touching? n Electric fields

1 - $500 n Describe the flow of electric charge. n What is current? Flowing electrons. Why do they flow? One pushes the next and they spread out. Why? Electrostatic repulsion.

2 - $100 n Type question to appear here n Type answer to appear with a mouse-click here

2 - $200 n Type question to appear here n Type answer to appear with a mouse-click here

2 - $300 n Type question to appear here n Type answer to appear with a mouse-click here

2 - $400 n Type question to appear here n Type answer to appear with a mouse-click here

2 - $500 n Type question to appear here n Type answer to appear with a mouse-click here

3 - $100 n What is made of atoms? n Everything!

3 - $200 n What are three components that make up an atom? n Proton, Electron, and Neutron

3 - $300 n Which of the components that make up atoms is mobile? n Electron

3 - $400 n Is an electron in a hydrogen atom the same as an electron in a uranium atom? n Yes, all electrons, protons, and neutrons are the same

3 - $500 n In a normal atom, how many electrons are there compared with protons? n Equal amounts

4 - $100 n Which two methods of charging objects involve touching? n Friction and contact

4 - $200 n Distinguish between an insulator and a conductor. n Conductors allow electrons to flow/move easily, while insulators do not

4 - $300 n How does an object become negatively charged? Positively? n Gains electrons, loses electrons

4 - $400 n If a glass rod that is rubbed with a plastic dry cleaner’s bag acquires a certain charge, why does the plastic bag have exactly the same amount of opposite charge? n However many electrons the glass rod gained, the plastic bag lost; charge is conserved!

4 - $500 n Explain how an object that is electrically neutral can be attracted to an object that is charged. n Polarization: the charged object either attracts or repels the electrons in the uncharged object, leaving areas of great negative and positive concentration

5 - $100 n Describe how electrons will distribute themselves on a conducting surface. n They will repel and spread out as much as possible.

5 - $200 n Describe how electrons redistribute themselves to achieve equilibrium. n They will repel and spread out as much as possible to get as close to a neutral equilibrium state as possible.

5 - $300 n If a charged sphere is brought in contact with another equally sized uncharged (neutral) sphere, how will the charges distribute themselves? n Equally

5 - $400 n If a charged sphere is brought in contact with another uncharged (neutral) sphere that is 50 x bigger, how will the charges distribute themselves? n The uncharged sphere will have 50 x more charge.

5 - $500 n You have two equal sized spheres, one with 2+ and 6 - charges, and one with 5+ and 5 charges; what will be the charge on each sphere when the sphere are brought in contact with each other? n -2 and -2

Final Jeopardy n Type question to appear here n Type answer to appear with a mouse-click here