Electric Fields (Now!)

How do like charges behave toward each other?

• Attracted

• Repelled

• No force

How do opposite charges behave toward each other?

• Attracted

• Repelled

• No force

Tags

NGSS.MS-PS2-3

What does it mean to say that charge is conserved?

• Charge is always the same.

• Electrons are neither created nor destroyed but are transferred from one material to another.

• Charge is never wasted.

Tags

NGSS.HS-PS1-2

How is Coulomb's law similar to Newton's law of gravitation? How is it different?

• Both describe fields, obey an inverse-square relationship with distance, and have a proportionality constant; The law of gravitation can only be attractive while electrical forces may either attract or repel.

• Both describe motion; Coulomb's law is French while Newton's law is English

• Both use really big or small numbers; Coulomb's law only applies to the very large

Tags

NGSS.HS-PS2-4

What is the SI unit of charge?

• Charge (C)

• Celsius (C)

• Coulomb (C)

• Crumpet (C)

Which two methods of charging objects REQUIRES touching?

• Friction

• Contact

• Induction

By how much is the electrical force between a pair of ions reduced when their separation distance is doubled (2x)? Tripled (3x)?

• 2 times less ; 3 times less

• 4 times less ; 9 times less

• 8 times less ; 27 times less

Tags

NGSS.MS-PS2-3

How is the strength of an electric field indicated with field LINES?

• By the length of arrows

• By the spacing of the lines

How is the strength of an electric field indicated with field VECTORS?

• By the length of arrows

• By the spacing of lines

What is meant by the expression action at a distance?

• the idea that things not in contact can still exert forces on one another

• the idea that you can do your job but stay at home

• the idea that every action has an equal and opposite reaction

Tags

NGSS.MS-PS2-5