I shared a document of topic ideas with you. Please visit it, and choose one of the topics for your group to research and present. Feel free to add other topics to the list. Next meeting will be Tuesday morning around 11:00am 🙂 We will review the periodic table and what makes an element.
Middle School Science Group – if you met with me on Thursday, work on your lab report. If I haven’t met with you yet, we will meet Monday morning.
Factors that are changing as you do an experiment are known as variables. We will discuss the three main types of variables – independent, dependent and controlled.
At the heart of science is the scientific method. Please click on the link and study/review the steps of this process. We will use Mythbusters later this week to study the scientific method and help us develop our own experiments.
NaHCO3 + H+ → Na+ + H2O + CO2
The study of Physics is the study of our Universe, and how the things within it interact with one another. The Universe is a complex place, and therefore its description is likewise complex. To begin to understand its workings, we often strip a situation down to its simplest state, and add back in complexities as our understanding increases. Unfortunately, this can be confusing to the student, as it asks them to imagine a situation which they *know* to be untrue (i.e. “what if there were no friction or air resistance”)
In their simplest explanation, high and low ocean tides are caused primarily by the gravitational force the Moon exerts on the Earth, and the fact that the force is a bit less on the side furthest from the Moon (this is also what is being referred to when someone mentions “being ripped apart by tidal forces” either in science fiction or science fact.)
The Sun, of course, also exerts tidal forces on the Earth, though due to the much greater distance between the bodies, the differences in forces are smaller; the tidal effects of the Sun are most noticeable in conjunction or opposition with the effects from the Moon.
follow this link to see the animation: NOAA: Tides
So, Saturday September 10, at approximately 5 pm: the Sun is setting in the west (as it does), and a half moon is high in the sky, nearly at its zenith. We should be nearly at a high neap tide, with low tide occurring around midnight, and another high tide about 6 in the morning, yes?
Spring tides. Low tide at 6:30pm. Only one high and one low tide per day. This is *not* the way the tides are supposed to work, and it’s North America’s fault…though South America certainly isn’t helping any.
The Continents mess things up. Due to Earth’s rotation, they push the water ahead of them so the tidal bulges precede the moon rather than lag behind. Coastal irregularities put a local spin on a global phenomenon. The Bay of Fundy in Nova Scotia has the world’s highest high tides. The Gulf of Mexico experiences only one high and one low tide per day.
“This map shows the geographic distribution of different tidal cycles. Coastal areas experiencing diurnal tides are yellow, areas experiencing semidiurnal tides are red and regions with mixed semidiurnal tides are outlined in blue.”
from NOAA (follow link for additional explanation)
Why does the Gulf have only one cycle of tides per day? I dunno. Why do Spring and Neap tides occur at opposite times to what they ‘should’? No idea. But someone knows. It might be something that’s readily understandable with a smallish amount of research – or it may take years of specialized study. For me, it’s enough right now to know that the anomaly is understood.
Some underestimate the importance of insects in our lives. Let’s take a
look at the benefits of having bugs in the world. For 9/13, we will answer the questions 1) What is entomology? 2) Why is entomology important?