Newton's Three Laws of Motion with Everyday Examples
Newton's three laws explain why objects move, speed up, slow down or stay put. They apply to a soccer ball, ... Read more
Neurochispas
Kinetic and Potential Energy and Conservation of Mechanical Energy
Energy is the ability to do work, and in mechanics it comes in two main forms: kinetic energy, the energy ... Read more
Density: Formula, Units and Why Things Float
Density tells you how much mass is packed into a given volume. A bowling ball and a beach ball have ... Read more
Ohm's Law and Simple Circuits: Series and Parallel Resistors
Ohm's law says that the current through a resistor is proportional to the voltage across it: double the voltage and ... Read more
Euler's Formula for Polyhedra: Faces, Edges and Vertices
Count the corners, edges and faces of almost any solid without holes and the three numbers always satisfy one short ... Read more
Heron's Formula: Area of a Triangle From Its Three Sides
Most area formulas for a triangle need a height, and the height is often the one measurement you do not ... Read more
Solving Triangles: Law of Sines, Law of Cosines and the Ambiguous Case
A triangle has six measurements: three sides and three angles. Usually you know three of them, and the job is ... Read more
Radians and the Unit Circle: What a Radian Really Is
Degrees are a human choice. The number 360 comes from ancient astronomy and divides nicely, but it has nothing to ... Read more
Frequency Tables and Histograms: How to Build and Read Them
A list of 40 exam scores is hard to read. A frequency table groups the scores into intervals and counts ... Read more
Variance and Standard Deviation Step by Step (Population vs Sample)
The mean tells you where the data is centered. It says nothing about how spread out the data is. Two ... Read more