Electric and Magnetic Forces

The number of positive and negative charges in an atom is USUALLY...

• equal.
• unequal.
• empty.

Tags

NGSS.MS-PS2-5

Lightning is caused by...

• a build up of positive and negative charges in the clouds. 
• clouds bumping into each other.
• too much energy from the sun.

A device that uses a free-moving magnetic needle to show direction is a:

• lodestone
• magnet
• compass
• magnetic field

A compass _______ is the part of a compass that is magnetic.

• bar
• dial
• needle
• rose

Tags

NGSS.MS-PS2-3

Why are magnetic poles called north and south?

• because the needle points up and down
• because it lines up with Earth's axis
• because magnets help with direrctions
• because it sounds cool

What causes electricity?

• moving neutrons
• moving protons
• moving atoms
• moving electrons

Tags

NGSS.HS-PS2-5

What type of electricity occurs when you rub a balloon on your sweater?

• thermal electricity
• current electricity
• static electricity
• work electricity

What happens when you touch a metal doorknob after rubbing your shoes on the carpet?

•  The doorknob sends a burst of electric current into your body
•  Millions of electrons go from your finger into the doorknob
• The doorknob sends millions of electrons into your finger
• Your finger becomes negatively charged

Tags

NGSS.MS-PS2-3

Lightning is a form of static electricity. What can you infer about what happens when lightning strikes the ground?

• Protons and neutrons are transferred from the clouds to the ground
• The ground becomes negatively charged
• . Electrons are transferred from the clouds to the ground
• An electric current is established between the clouds and the ground

Tags

NGSS.MS-PS2-5

The movement of electrically charged particles is 

• electric current
• electric circuit
• electric resistance