A beautiful proof of why slicing a cone gives an ellipse.

Astronauts need to know their mass while in orbit, but a normal scale would be free-falling around the Earth with them. So how do they measure their mass without gravity?

A beautiful proof of why slicing a cone gives an ellipse.

In a word, "yes" - space is packed with gravity. Hank explains how Isaac Newton described how gravity works, and why even though it seems that things are floating in space, they're still effected by gravity. Every object in the universe...

In this video Paul Andersen explains for the position of an object over time can be used to calculate the velocity and acceleration of the object. If a net force acts on a object it will experience an acceleration.

In this video Paul Andersen explains how the mechanical energy added or removed from a system results from work. For work to occur a force must act parallel to the displacement of the system. Since work and energy are equivalent the...

Gases are everywhere, and this is good news and bad news for chemists. The good news: when they are behaving themselves, it's extremely easy to describe their behavior theoretically, experimentally and mathematically. The bad...

We've talked about AC Circuits, but now it's time to delve into the world of AC Circuits (or Alternating Currents). We’ve talked about how they change voltage, which helps transmit electricity over long distances, but there’s so much...

In this video Paul Andersen explains how matter, like light, can be treated as both a particle and a wave. Louis de Broglie proposed that matter could act as a wave and described the wavelength of matter as a function of Planck's...

In this video Paul Andersen explains how simple harmonic motion occurs when a restoring force returns an object toward equilibrium. The two types of harmonic motion studied in AP Physics are the mass spring oscillator and the simple...

So, how do those defibrillators you see on TV actually work? Surprise! Physics can explain! Okay buckle up, everyone! Today, Shini has the task of breaking down Electrical Potential Energy, Electric Potential, Voltage, Capacitors, Energy...

In this Algebra 1 video, students quickly analyze a table of values and four possible functions to determine which function best represents the data. We begin by noticing the domain increases by 1 each time, but the range does not have a...

In this math video we will learn how to interpret, use and write an equation. We will review how an equation represents a real world relationship where y represents miles and x represents hours. We will also review that the coefficient...

Watch the continuity equation of ideal fluid flow in action using a real river example. A clear, visual explanation perfect for physics students.

This video explains Git tags.

Einstein Field equations explained intuitively and visually: Isaac Newton changed our paradigm by connecting earthly gravity, with the movement of heavenly bodies. He formulated an equation that is...

Some say that it could not have occurred by chance, that there must be some agent, like a god that set up the constants to enable life.



Let's just look at the constants associated with the different...

Parkinson's disease affects nearly 1 million people and their loved ones. 15-year-old Zoe Butchen from Ridgefield, CT knows these affects all too well. This charitable teen's father was diagnosed with Parkinson's disease last year....

Howcast - Learn how to get inspiration for unusual tattoo ideas and designs from the experts at Area 51 tattoo studio in this Howcast tattoo video.

Howcast -Beat "Last of the Palaiolgi" from Assassin's Creed Revelations with this online demo of the fourth installment of the series from Ubisoft.

Parkinson's disease affects nearly 1 million people and their loved ones. 15-year-old Zoe Butchen from Ridgefield, CT knows these affects all too well. This charitable teen's father was diagnosed with Parkinson's...

Pupil outcome: I can explain how increasing or decreasing the minuend affects the difference. Key learning points: - If I increase the minuend, the difference increases by the same amount. - If I decrease the minuend, the difference...

Pupil outcome: I can explain and represent constant difference for subtraction. Key learning points: - If the minuend and subtrahend are both increased by the same amount, the difference stays the same. - If the minuend and subtrahend...

Pupil outcome: I can use the same difference rule to balance equations. Key learning points: - If I add __ to the minuend and add the same number to the subtrahend, the difference stays the same. - If I subtract __ from the minuend and...