The wavy structure of the grooves causes the needle to be pushed in different directions as the record spins. 

How does the structure of the record result in different sounds being produced?

What property of this wave is represented by the letter “A”

Which of the following is true about the motion of the objects?

When we dropped a rock onto the table with a laser beam (dot) bouncing off of a mirror on the table, the dot that showed up on the wall or ceiling but did not move because solid objects cannot vibrate.

Striking a shorter stick and measuring its position with a motion sensor should help us simulate what is happening with a tine (or a xylophone bar or a guitar string) that is producing a higher note.

What length of xylophone bar would you strike to make a low pitch note?

Opposite Poles…

 If the distance represented by the letter A were increased, how would it change the way the sound was heard?  

How are electromagnets different from permanent magnets?