Magnets

Ten Facts about Magnets


(from the book Driving Force)


1. North poles point north, south poles point
south.


2. Like poles repel, unlike poles attract.


3. Magnetic forces attract only magnetic materials.



4. Magnetic forces act at a distance.


5. While magnetized, temporary magnets act like permanent
  magnets.


6. A coil of wire with an electric current flowing through it
  becomes a magnet.


7. Putting iron inside a current-carrying coil increases the
  strength of the electromagnet.


8. A changing magnetic field induces an electric current in a
  conductor.


9. A charged particle experiences no magnetic force when
moving  parallel to a magnetic field, but when it is moving perpendicular to the
field  it experiences a force perpendicular to both the field and the direction
of  motion.


10. A current-carrying wire in a perpendicular magnetic field
  experiences a force in a direction perpendicular to both the wire and the
  field.


The Tricky Triangle
Solve this by placing a magnetic marble in each hole.  You'll find it;s very difficult and addictive.

Tumbling Monkey
The monkey stays on the track because of the magnets on the axis of the wheel.
They are strong enough to hold the wheel to the track when its moving. But when
gravity and friction slow the wheel down enough to allow centripetal force to
overpower the magnetic force, it will fly off the rails on the outside curve
farthest from the handle.