By Muriel Mandell
103 tasks show composition of gadgets, how elements are laid low with a variety of kinds of power — warmth, gentle, sound, electrical energy, mechanical strength, extra. How a thermometer measures warmth, how an electrical bulb emits gentle, how shadows are shaped, how one can make a periscope, how you can make a rainbow, extra. Over a hundred illustrations.
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34 Explanation: The soap reduces the surface tension. It is one of the reasons we use soap for cleaning. By lowering surface tension, soap makes water able to wet greasy surfaces. SOAP BOAT Use a piece of soap as the fuel for a cardboard boat. Place a notch in your boat and insert a dab of soap. Put your boat in a tub or basin of water. The boat will sail until the soap reduces the surface tension of all the water in your lake. HOLDING WATER IN A STRAINER Pour some liquid oil over a small strainer (a tea strainer will do).
Like the teeth of a gear and interlock or ~ mesh with the teeth of the gear next to it. You will notice that each gear turns in the opposite direction to the gear next to it. When the gear in the middle turns counterclockwise, the two on the ends turn clockwise, for example. Thus gears can be used to change the direction of the turning of an axle. A good example of this is when a car is shifted into reverse to make the rear wheels turn backward. In addition to changing direction, gears also are used to change force or speed.
It's handy to know, too, that a little wax (a kind of hard oil) will help you open and close your desk drawers more easily. 45 MACHINES A machine is anything which makes work easier because it helps us in some way to push or pull. The machine may allow less effort on our part, or it may increase speed, increase distance, or change direction. All of our complicated machines are based on two or more simple machines which have existed for thousands of years. These are the lever, the wheel and axle, the pulley, the inclined plane, the wedge, and the screw.