By William C. Robertson
By means of William C. Robertson, Ph.D. Make earth technological know-how educating a often sunny event with this best-selling job advisor! uncomplicated houses of air and water are truly and correctly defined and are observed through drawings and hands-on actions utilizing available fabrics. those techniques then turn into the root for illustrating climate styles together with the jet move, hurricane fronts, tornadoes, and hurricanes. 134 pages. Paperback. Grades 3-8.
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Extra info for Air, Water, & Weather: Stop Faking It! Finally Understanding Science So You Can Teach It
14 Because the large object has more surface, more fluid molecules hit it. Gravity is “turned off” in this example. 15 Because we’re ignoring gravity, the forces exerted by the fluid on the object all cancel out. 50 Because we’ve turned off gravity (don’t worry about floating away—we’re just pretending), the objects get hit equally on all sides. 15). National Science Teachers Association Chapter Of course, we can’t turn off gravity. Gravity pulls down on the fluid (we call that the fluid’s weight).
If you agree with those statements, then we’re set to move on. If you don’t agree with those statements, then you’ll have to spend the night in the box and get your mind right,3 because those statements are the truth. Start by filling two bags with water and putting them on your craft stick balance. Do they weigh the same? In other words, does the contraption stay in balance with water-filled bags on each end of the stick? It should, more or less. A tiny tilt one way or another shouldn’t be a big deal.
You can take an object anywhere in the universe and its mass will not change. Because gravitational forces get weaker with distance, though, the weight of something will change the farther you get away from the Earth. Okay, so why am I making that distinction? Because although there is something known as weight density, for the rest of this book we’re going to use the concept of mass density, which is how much mass a given volume of substance has. Here’s the definition. mass density = mass of an object or substance volume of the object or substance That relationship expressed in symbols is ρ = m V where ρ is the Greek letter “rho” (pronounced as in “row, row, row your boat”), m represents mass, and V represents volume.
Air, Water, & Weather: Stop Faking It! Finally Understanding Science So You Can Teach It by William C. Robertson