a magnet

two nails

 

 1. Approach a nail to the magnet, then approach the nail to the other nail.

The first nail attracts the second.

2. Leave the nail stuck to the magnet, keeping it stuck to the magnet only on one end.

The first nail attracts the second and they remain united.

3. Remove the magnet

The nails remain stuck one to each other 

The magnetic force is transmitted to the nail and becomes much stronger than the one in the magnet.

Two sheets of paper equal

1 Wrapped one of the two sheets.

2 At the same time and at the same height let off both of the papers.

The wrapped paper comes to the floor faster than the straight paper. The other paper, the straight one, floats slowly.

If there wasn’t air, the objects would have landed right on the floor and with the same speed, attracted by the force of gravity. The air behaves as an obstacle in their fall. The larger the object is, the more he falls down.

Why do some objects float and others don't?

Clay

A bowl with water

Various other things

1. Fill the bowl with water.

 2. Use clay to make a ball and put it in water

 3.Use clay to make a boat and put it also in water.

 4. Add various objects on the boat.

 

The ball is going down.

The boat floats.

If we put various objects in water, they will float.

Boat is concave and contains air. Since the displaced water weighs more than the tray, it floats. If the bowl exceeds the weight of water displaced, it sinks. Ships, even if they are made of iron, not sink, because there are areas of air inside them.

Holes in Water

 talcum powder

 water

 liquid soap

 a bowl

1. Fill the bowl with water

2. Sprinkle talcum powder on the surface of your water

3. Put a finger in the water.

If you touch the surface, it deforms and your finger doesn’t get wet.

4. Put your finger in soap and then put it in water.

When you put your finger first, it removes the talcum powder. Then the finger will leave holes in talcum powder.

Fishing

A few sheets of colored plastic

 Paper clips

 A magnet

 A bowl of water

 Scissors

1.Cut the colored plastic and create some fishes

2 Catch a clip of each fish’s mouth

4. Fill the bowl with water and put the fish inside.

 5. Put the magnet near water without touching the fish.

Pisces rises to the magnet as it was fishing.

The magnet attracts a greater force than the force of gravity.

Magnetic force can overcome the force of gravity.

Boat and Soap

 

 -A bowl

 -A piece of cardboard

-A pair of scissors

 -Liquid soap

-Water

 1. Fill the bowl with water

 2. Create a triangle from paper and put it in the corner

 3. Place a drop of soap on your finger and put your finger in the water behind the cardboard triangle.

The cardboard triangle begins to move toward the opposite side of the vessel.

At the beginning of the experiment the cardboard surface tension is not moving because it draws in all directions. But the soap reduces the surface tension.

Flowers and Water





-a sheet of paper

-crayons

-scissors

-a deep bowl with water

-the figure illustrated on this paper

-markers

1. Spawn and then color the picture (the flower)

2. Bend inwards paper flower petals and put the flower on the water. 

Slowly, the flower opens.

Water penetrates through the capillaries of the spaces found in the fibers to swell and paper and flower opens.

What do we learn from here: usually the water is moving downwards, but can climb up and through the capillaries.

How to make foam?

-A clean and empty plastic soda bottle

-Small cup
-1/2 cup hydrogen peroxide liquid 

-1 Tablespoon of dry yeast

-3 Tablespoons of warm water
-Liquid dish washing soap

NOTE: The foam will overflow, so be sure to do this experiment on a washable surface.

1. Hydrogen peroxide can irritate skin and eyes, so put on safety goggles and ask an adult to carefully pour the hydrogen peroxide into your bottle.

2. Add 8 drops of your favorite food coloring to the hydrogen peroxide.

3. Add about 1 tablespoon of dish soap (the kind that comes as a liquid) into the bottle and shake the bottle to mix it.

4. In a separate cup, combine the warm water and the yeast together and mix them for about 30 seconds.

5. Now the adventure starts! Pour the yeast+water mixture into the bottle (a funnel helps) and watch the foaminess begin! 

Foam is awesome! The foam you made is special because each tiny foam bubble is filled with oxygen. The yeast acted as a catalyst (a helper) to remove the oxygen from the hydrogen peroxide. Since it did this very fast, it created lots and lots of bubbles. Did you notice the bottle got warm? Your experiment created a reaction called an Exothermic Reaction - that means it not only created foam, it created HEAT! The foam that was produced is just water, soap, and oxygen so you can clean it up with a sponge and pour any extra liquid left in the bottle down the drain.

This experiment is sometimes called "Elephant's Toothpaste" because it looks like toothpaste coming out of a tube, but don't get the foam in your mouth! 

-Food coloring