Both have North and South Poles; both have magnetic field
Compare the speed of sound in vacuum, solid, liquid, and gas.
Vacuum (=0) < Gas < Liquid < Solid
Which medium is glass? Why? (A/B/C/D)
D
Draw the magnetic field lines with their direction to describe the difference between magnetic fields of a bar magnet and a U-shaped (horseshoe) magnet.
If the north pole is placed with the north pole of another magnet, they will repel. True or false?
True
The compass needle is free to turn to point north-south because ______
the Earth has a magnetic field.
Magnets can attract iron nail. True or false?
True
Which does cause sound? How does sound travel?
Vibration causes sound. Sound travels though sound waves.
A magnet is an object that produces a magnetic field. True or false?
True
Is the upper side of the compass South, North, East, or West?
North
Name 2 kinds of noise pollution and give examples for each kind.
Natural and artificial noise pollution.
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