Soil is the foundation of every terrestrial ecosystem, and because it is always underfoot, it is often overlooked, and almost always underappreciated. Furthermore, every soil has a story, and there is science behind that story. I use soil to introduce science concepts, and use science concepts - physics, chemistry, biology and ecology - to describe and observe soils.
to me this looks like black magic. how does the scale register the weight if the object is suspended bo something outside the scale? does the string itself interfere with the reading?
This is a horrible representation of an apple as Earth. If you scaled down the Earth to the size of an apple, all of the mountains and oceans and people and every part of society would be in the skin of the apple. Humans have never penetrated the skin of the apple. He gives the children a false perception of Earth making it seem like the oceans and all that would represent the majority of the apple, and that is absolutely not the case. Very bad teacher.
the water weight is often too heavy for many jewel scales, because your goal is just to get the weight difference of the rock in air and in water, you do not need to put water container on the scale. You need to smartly use the jewel scale in a "spring scale" way. that is, you need to hang the rock to the scale. To do this, move water container to underneath the scale, use a metal hook to hook on the center of the scale, the hook's lower end will be right underneath the scale so that you can hang the rock on it to merge into water container (if you form the wire a heart shape, you put the scale in the heart, that's it). How to make water container go under the scale? of course, you can use your hand palm to hold the scale above the water (I use a 2"x3" x 2' long wood beam to hang out of table)
@@LANDSHARKK because to lift the stone there is 2 components, him pulling the string and the water aplying pressure to the bottom of the rock. And we know that force cant just go in one direction so the neutral force from the water gets applied to the scale in turn showing the weight. Just a guess.
The rock displaces a volume of water = to its volume. Notice the volume of water in the container appears to increase, the volume of the water plus the rock. The mass of the water increases an amount equal to the volume of the rock. See this video about Archimedes, the first to express the principle of displacement. ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-KMNwXUCXLdk.html
The rock displaces a volume of water = to its volume. Notice the volume of water in the container appears to increase, the volume of the water plus the rock. The mass of the water increases an amount equal to the volume of the rock. See this video about Archimedes, the first to express the principle of displacement. ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-KMNwXUCXLdk.html
