Download Ancient Science: 40 Time-Traveling, World-Exploring, by Jim Wiese PDF

By Jim Wiese

Dig into the technological know-how of precedent days and unearth notable discoveries!
* have you questioned the place paper comes from, who made the 1st identified maps, or how the traditional Egyptians have been capable of construct the pyramids?
* do you want to make your individual sundial, become aware of easy methods to notice earthquakes, or learn how to write in hieroglyphics?
* Are you trying to find nice principles on your subsequent technology reasonable undertaking?

If you replied "Yes" to any of those questions, then historical technology is for you! From Greek lighthouses and Roman bridges to chinese language kites and Mesopotamian cleaning soap, you'll examine the various maximum medical discoveries and the folk who brought them to the realm. Dozens of fun-packed actions assist you see for your self how the earliest people cultivated crops, why tools make assorted sounds, how fireworks get their explosive strength, and masses extra. the entire initiatives are secure and straightforward to do, and all you would like is daily stuff from round the residence. So step again in time and take an awesome trip with historical technology!

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Extra resources for Ancient Science: 40 Time-Traveling, World-Exploring, History-Making Activities for Kids

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You can calculate the mechanical advantage by using the equation: mechanical advantage = load force effort force = 900 N 100 N = 9 This means that the ramp multiplies the effort force by nine times. However, even though you only need one-ninth the force to move the wheelchair, you have to push it nine times as far. The net result will be that the same amount of work will be done. Simple machines 36 will make the tradeoff of a decreased effort for an increased distance in order to accomplish a task.

When the jar and rock are first placed in the water and the tube is pinched, the air pressure in the jar is equal to the pressure of the water in the tub, and your diving bell floats. When you release the tube, the water takes the place of the air inside the jar, forcing it out through the tube, and the diving bell is pulled down. By blowing into the tube, you increase the amount and pressure of the air inside the bottle. The air displaces the water in the bottle and the diving bell rises back to the surface of the water.

In this activity, the sound the plucked string made when the pencils were 4 inches (10 cm) apart was one octave higher than the one when the pencils were 8 inches (20 cm) apart. ) believed that everything in the world could be ordered and that there were mathematical relationships in many things that we take for granted. He and his students studied music and how the length of a string affected the sound it would make. They discovered that if successive strings were each a fraction of the length of the longest string, they would make the most pleasing sounds to the human ear.

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