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Physics Concept
Your depth perception depends on the use of both eyes. Each eye sees a different image and your brain combines those images into one. At the same time your eyes triangulate the di...
You can make a simple magnifier with just your fingers. Pinch together your thumbs and forefingers so that a small hole is formed at point where they pinch together. Put a book with small print on ...
There is an interesting related magnifier effect that I saw first when I put some oil into a pot for boiling spaghetti. Put a few drops of clear cooking oil into a pan that has about an inch of wat...
Physics Concept
This uses a drop of water instead of a curved glass to make a magnifier - or demagnifier. If the water meniscus is above the top of the straw you have a magnifying glass.
If the...
Physics Concept
Light is bent by the shape of a transparent object and by its index of refraction. The index of refraction of a material = (speed of light in vacuum)/ ( speed of light in the mate...
Physics Concept
We are able to determine where sounds come from because we have two ears, a smart brain, and because sound travels at 330 m/s (about 1000 feet/second)
Most people can determine ...
Physics Concept
The corruga horn works like the soda straw oboe except that the Bernoulli effect draws the air through the horn, and the corrugations, not reeds, cause the air column to vibrate. ...
Physics Concept
All musical instruments involve something that vibrates the same way over and over again. In this case the air in the soda straw produces the sound. The tabs on the straw act like t...
Physics Concept
This is an illustration of a type of wave in which each object rotates. It is also a model for how the ribs are mounted on a persons spinal column, or the ribs of a fish. Torsiona...
Physics Concept
Water is a molecule made of oxygen and hydrogen. Electrical forces hold the molecule together and electrical forces can be used to tear it apart.
Materials
Cup of water, salt,...
Physics Concept
Magnetic fields exert forces on electric currents.
Materials
Battery, 2 feet of copper wire, magnet, paper clips, tape, felt tip marker
Method
Tape the paper clips to the ...
Physics Concept
All magnetic forces come from moving charges. The electrons moving around iron atoms make iron magnetic. An electric current through a wire also produces a magnetic field and can ...
Physics Concept
Where is the North pole on a flat magnet of the type that you use to post notes on the refrigerator at home? The answer is that there are several north and south poles. You can le...
Physics Concept
Some foods are fortified with iron by adding elemental iron, sort of like iron filings. Iron filings may not seem very digestible but they taste better than chicken liver in your ...
Physics Concept
An electric current produces a magnetic field. A current through a coil of wire make a field that goes straight through the center of the coil, and outside of the coil the field i...
Physics Concept
A new horseshoe magnet is usually are supplied with a keeper, a piece of soft iron that is held across the north and south poles. The keeper has two purposes. It helps the magnet ...
Physics Concept
Most of the strength of a magnet is at the poles. The rest of the magnet does not exert a magnetic force.
Materials
Magnet and paper clips
Method
Hang paper clips on a ...
Physics Concept
This is a simple compass that uses the surface tension of water to provide a support. It is very sensitive so do not move a magnet too close to it.
Materials
Needle, magnet, ...
Physics Concept
Making a simple compass. The paper clip always lines up parallel to the magnetic field lines.
Materials
Nail and a magnet, paper cup, thread and a paper clip.
Method
Strok...
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