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1-20 of 39 results


Acceleration

from Khan Academy (Free)

In a world full of unbalanced forces (which you learn more about when you study Newton's laws), you will have acceleration (which is the rate in change of velocity). Whether you're...

Balanced and unbalanced forces

from Khan Academy (Free)

You will often hear physics professors be careful to say "net force" or "unbalanced force" rather than just "force". Why? This tutorial explains why and might give you more...

Big bang and expansion of the universe

from Khan Academy (Free)

What does it mean for the universe to expand? Was the "big bang" an explosion of some sort or a rapid expansion of space-time (it was the latter)? If the universe was/is expanding,...

Centripetal acceleration

from Khan Academy (Free)

Why do things move in circles? Seriously. Why does *anything* ever move in a circle (straight lines seem much more natural). ? Is something moving in a circle at a constant speed...

Cepheid variables

from Khan Academy (Free)

Stellar parallax can be used for "nearby" stars, but what if we want to measure further out? Well this tutorial will expose you to a class of stars that helps us do this. Cepheids...

Displacement, velocity and time

from Khan Academy (Free)

This tutorial is the backbone of your understanding of kinematics (i.e., the motion of objects). You might already know that distance = rate x time. This tutorial essentially...

Earth's rotation and tilt

from Khan Academy (Free)

What causes the seasons? Even more, can Earth's climate change over long period just to "wobbles" in its orbit? This tutorial explains it all. You'll know more about orbits (and...

Electricity and magnetism

from Khan Academy (Free)

Fluids

from Khan Academy (Free)

Harmonic motion

from Khan Academy (Free)

Every watch a slinky gyrate back and forth. This is harmonic motion (a special class of oscillatory motion). In this tutorial we'll see how we can model and deal with this type of...

History of life on earth

from Khan Academy (Free)

Earth is over 4.5 billion years old. How do we know this? When did life first emerge? From the dawn of Earth as a planet to the first primitive life forms to our "modern" species,...

Humanity on earth

from Khan Academy (Free)

Where do we think humans come from? How and why have we developed as a species. This tutorial attempts to give an overview of these truly fundamental questions. From human...

Inclined planes and friction

from Khan Academy (Free)

We've all slid down slides/snow-or-mud-covered-hills/railings at some point in our life (if not, you haven't really lived) and noticed that the smoother the surface the more we...

Kinematic formulas and projectile motion

from Khan Academy (Free)

We don't believe in memorizing formulas and neither should you (unless you want to live your life as a shadow of your true potential). This tutorial builds on what we know about...

Life and death of stars

from Khan Academy (Free)

Stars begin when material drifting in space condenses due to gravity to be dense enough for fusion to occur. Depending on the volume and make-up of this material, the star could...

Life in the universe

from Khan Academy (Free)

Are dolphins the only intelligent life in the universe? We don't know for sure, but this tutorial gives a framework for thinking about the problem.

Light and fundamental forces

from Khan Academy (Free)

This tutorial gives an overview of light and the fundamental four forces. You won't have a degree in physics after this, but it'll give you some good context for understanding...

Measuring age on earth

from Khan Academy (Free)

Geologists and archaeologists will tell you how old things are or when they happened, but how do they know? This tutorial answers this question by covering some of the primary...

Mechanical advantage

from Khan Academy (Free)

If you have every used a tool of any kind (including the bones in your body), you have employed mechanical advantage. Whether you used an incline plane to drag something off of a...

Metaphysics and epistemology

from Khan Academy (Free)