Tuesday, April 17, 2012

3.19.12 Magnetism

We covered several Experiments today.
Experiment Kit 25 #1

Use a horseshoe magnet to pick up things around the house.

Objects made of certain metals stick to the magnet.

Metals such as iron, steeland nickel stick to magnets
Metals such as brass, aluminum, stainless steel do not stick to magnets.

Experiment Kit 25 #2
magnet, pencil, 2 ring magnets,

Put a pencil through two ring magnets ad hold it vertically on a table with your finger on one end.
Try to make the upper magnet float (without touching it)
You may need to flip the upper magnet over and then replace it on the pencil.

When the upper ring magnet is put on the pencil with a certain side up, the two magnets repel each other and the one on top floats.

When the upper ring magnet is flipped over and then put on the pencil, the two magnets they will attract each other.

The rings have a north and a south pole. When the two South poles or two North poles face each other they repel.

When the north and the south face each other they attract.

Experiment Kit 25 #3
magnet, iron filings, lodestone

Try to pick up iron filings with the ring magnet.
Try to pick up iron filings with the lodestone.
Results:The iron filings can be picked up by both the magnet and the lodestone.

The lodestone is magnetic.

Experiment #4

magnets; horseshoe, circle, bar, iron filings, cardboard

1. Put a piece of cardboard or paper on top of the bar, horseshoe and ring magnets.

2. Sprinkle a little bit of the iron filings on top of each piece of cardboard.

3. Tap the cardboard gently.

4. Observe.
What happens?
The iron filings change to the shape of the magnet.

The iron filings are metal and the magnet attracts the filings into a pattern.

This shows that magnet’s force works all around but it is strongest at its north and south poles.

The entire area where a magnet’s force works is called the magnetic field of that magnet.

Magnetism; Static Electricity
Kit 25 Experiment #5
Iron filings, cardboard, scissors, pen, tape, plastic bag

1. Draw a face on cardboard

2. Cut out a piece of the plastic bag big enough to cover the cardboard front and back.

3. Tape the plastic tightly around the cardboard, but leave one edge open

4. Put iron filings through the open side and then tape shut.

5. Use any of the magnets to move the filings around.

The iron filings are metal and are attracted to the magnet even when it moves.

Conclusion:This is how magna doodle toys work.

Experiment # 6
Straw, magnet, pin, bowl, water, tape

1. Cut the straw in half

2. Magnetize a pin by stroking it with the bar magnet from the head to the point 30 times (one direction only).

3. Put the pin inside one of the halves and seal both ends of both straw halves with tape.

4. Put both the straw halves in a bowl of water.

5. Push the straws gently around.

6. Observe what happens.

The straw with the pin always points in the same direction.

The pin in the straw behaves like a needle in a compass, always pointing to the Earth’s northpole.


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