PHET Charges and Charged Objects Investigation Part 3

The character in “John Travoltage” became charged by ​ (a)  

• friction
• conduction
• induction

When the character in John Travoltage touched the door knob charge was transferred by​ (a)  

• conduction.
• Friction
• Induction

In the first lab, the balloon become charged by ​​ (a)   .

• friction
• conduction
• induction

Think of the balloon and sweater.  For one object (like the balloon) to become negative it means another object (like the sweater) must become equally what?

• negative

• positive

• neutral

• charged

During the balloon and sweater simulation, did the total number of charges change when charges were moved from one object to another?​ (a)  

• No
• Yes

Which object showed polarization?

• Balloon

• Sweater

• Wall

• John Travoltage

• Door Knob

After reading the definitions and seeing the lab, explain how polarization allows for the negative balloon to be attracted to the neutral, but polarized, wall.

What needs to happen for an object to have a negative charge?

• The positive charges must be removed.

• Electrons with a negative charge are transferred to the object.

• There must be a chemical reaction creating negative ions.

• The object must be connected to an electric current.

What needs to happen for an object to have a positive charge?

• Positive charges are added.

• Electrons with a negative charge are transferred out of the object.

• A chemical reaction creating a positive ion.

• The object must be connected to an electric current.

An object is neutral if it has NO electrons and NO protons?

​ (a)  

• False
• True