Physical Science

Enthalpy | Crash Course Chemistry

Icon: 
Streaming icon

In this episode, you'll learn what the state function is, and how it varies from a path-dependent function; why enthalpy change is different from heat; that bonds are energy and to form and break them they release and absorb heat to and from their environment. You'll get the quickest introduction to calorimetry ever (more on that in upcoming episodes) and learn the power of Hess's Law and how to use Germain Hess's concept of the standard enthalpy of formation to calculate exactly how much heat is produced by any chemical reaction.

NOVA: Uneven Sea Level Rise

Icon: 
Streaming icon

Learn why sea level will not rise uniformly around the world, in this clay animation video from NOVA Digital. Physical oceanographer Fiamma Straneo explains the effects of weather, the natural tilt of the oceans, expansion of water, and gravity on sea levels.

This resource was developed through WGBH’s Bringing the Universe to America’s Classrooms project, in collaboration with NASA. Click here for the full collection of resources.

Group Metals

Icon: 
Streaming icon

Metals are grouped according to their characteristics. This video segment uses the periodic table for an in-depth discussion. Watch a demonstration about the difference between metals.

Physics Chapter 14, Lesson 01 - Mirrors

Icon: 
Streaming icon

Law of Reflection, diffuse reflection, regular reflection, plane mirror images, uses for plane mirrors, curved or spherical mirrors, concave mirrors

When Chemicals Meet Water | Chemistry: Unit 8

Icon: 
Streaming icon

This half-hour program explores when chemical reactions happen in solutions—, whether inside an espresso machine or in a human cell. For example, when we breathe, the nitrogen in the air dissolves in our blood. Henry's Law gives us the power to predict, prevent, and treat "the bends"—a life-threatening condition that can happen to SCUBA divers when nitrogen in the blood comes out of solution and forms gas bubbles. Solution chemistry provides tools to measure the concentration of components of solutions, like the CO2 levels in ocean water. Knowing the concentrations of components in solutions can help determine the health of the world.

Friction | Crash Course Physics

Icon: 
Streaming icon

Why is it hard to move a heavy bookcase across a carpeted floor? And why is it easier to keep it moving than it was to get it started moving? You might think it's all about weight, but actually it's about friction. Two kinds of friction! Today, Shini tells us about Static and Kinetic friction; how they work and how they're different.

Anti-Gravity and the True Nature of Dark Energy | PBS Space Time

Icon: 
Streaming icon

We’ve come a long way in our understanding of dark energy. In previous episodes we’ve looked at how our universe is paradoxically flat and how dark energy is exponentially accelerating the expansion of the universe. Now, let's dive into the true nature of dark energy and how its antigravity effect and its other properties are having such bizarre effects on our universe.

Is Gravity an Illusion? | PBS Space Time

Icon: 
Streaming icon

Most of us take gravity as an assumed part of our living realities, but why? Basic physics introduces us to the concept of gravity from a Newtonian sense, but when you start factoring Einstein into an understanding of gravity, things get… weird. For example, gravity may simply not exist. Why? Watch this week’s episode of PBS Space Time and find out why gravity may be an illusion!

Peep and the Big Wide World | A House for Teddy Bear

Icon: 
Streaming icon

Teddy bears may not speak much, but most teddy bear owners could probably guess what their favorite stuffed animal would want in a home. With this knowledge, how should one go about designing and building a teddy bear's dream home? In this video segment from PEEP and the Big Wide World, children take an experimental approach to creating a new house for a teddy bear, and learn some important engineering techniques along the way.

STEM from the START | Materials 1

Icon: 
Streaming icon

The Quinks surprise Willow with a chair made of cardboard for her birthday, but Willow doesn't want to sit in it. Can you guess why?

Willow and the Quinks learn all about the materials different things are made of and the properties some materials have. The Quinks learn that the properties a material has can be very important when deciding what materials to use when you are making something. 

Pages