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Category: sciences

Scientific Notation

By Jack Posted on March 3, 2013 Posted in chemistry, math, physics, sciences

Tutoring physics or chemistry, you need to explain scientific notation. Scientific notation is very easy to use; it was designed to be.  To start with, we need to realize the “everyday” way we write numbers is called “float” (aka “normal”). …

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Significant Figures: Adding and Subtracting

By Jack Posted on December 20, 2012 Posted in chemistry, physics, sciences

We continue our commentary on significant figures – aka significant digits – with how to add and subtract them.  A chemistry or physics tutor deals with this topic periodically. If you look over my last few posts, you’ll see the accumulation of articles …

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Significant Figures: Multiplying and Dividing

By Jack Posted on December 14, 2012 Posted in chemistry, physics, sciences

When you tutor physics or chemistry, most calculations require management of significant figures (aka significant digits).  Today, we’ll look at multiplying and dividing. We know from earlier posts (see the previous one here) why significant figures are needed and how …

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Significant Figures: Zeros

By Jack Posted on December 7, 2012 Posted in chemistry, physics, sciences

Tutoring physics or chemistry, significant figures are part of the landscape.  Knowing when zero is significant can be tricky. In this, our second installment on significant figures (see the first one here), we start on the practical question,  “What digits are significant?”  …

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Significant Figures: Genesis

By Jack Posted on December 6, 2012 Posted in chemistry, physics, sciences

When you tutor chemistry or physics, significant figures are a constant theme.  Some people call them significant digits.  We’ll start our explanation today. Bill:  How heavy is that boat? Joe:  Maybe 30 tons, give or take a couple. Bill:  Then …

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Physics: Newton’s First Law

By Jack Posted on November 22, 2012 Posted in physics, sciences

Tutoring high school physics, you get the privilege of retelling Newton’s three Laws.  They can’t be discussed too often. Newton’s First Law: If no unbalanced force acts on an object, it either continues moving in a straight line at constant speed, or else remains in its …

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The Tectonic Plates: Floating Islands of Rock

By Jack Posted on November 6, 2012 Posted in earth science, sciences

Tutoring high school science, you might be asked about plate tectonics at any time.  Here is the most condensed, pragmatic explanation you’ll likely find. To believe in plate tectonics – which, by the way, is true beyond any doubt – you need …

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Neutrons and Isotopes

By Jack Posted on September 19, 2012 Posted in chemistry, sciences

Tutoring high school chemistry, isotopes are an early topic.  Let’s have a look…. From basic atomic structure, we know that an atom’s mass comes from its number of protons plus its number of neutrons.  Take fluorine, for example:  its mass is 19.  It’s …

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Metric System: decimal places and -re

By Jack Posted on September 17, 2012 Posted in math, sciences

When you tutor sciences, you’re immersed in the metric system.  Let’s talk a bit about it. The metric system uses multiples of 10.  Therefore, to convert from any metric unit to any other one, you just need to move the decimal point;  you needn’t …

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