Today Shini explains the law of conservation, beginning with simple, steady-state systems. We’ll discuss conversion and yield, accumulation, and how generation and consumption can affect how much accumulation there is in a system.
It can be really important to separate out chemicals for all kinds of reasons. Today we’re going over three different processes engineers use to achieve that separation: distillation, which separates substances based on their different boiling points; liquid-liquid extraction, which uses differences in solubility to transfer a contaminant into a solvent; and reverse osmosis, which filters molecules from a solvent by pressurizing it through a semipermeable barrier.
A realistic mass and spring laboratory. Hang masses from springs and adjust the spring stiffness and damping. You can even slow time. Transport the lab to different planets. A chart shows the kinetic, potential, and thermal energy for each spring.
Did you know we can actually make diamonds in a lab? It's true! We can! In this episode of Crash Course Kids, Sabrina shows us how materials scientists have done just that and why it's so important.
So, we know what materials are, but can we make new materials? Or improve the materials we already have? In this episode of Crash Course Kids, Sabrina shows us how Material Scientists are working on these two things today.
In this episode of Crash Course Kids, Sabrina uses what she knows about properties of objects to solve the mystery of what she tripped over last night.
PHYSICAL SCIENCE
Build your very own trebuchet and catapult yourself to victory! You'll learn more about levers, simple machines, and the principles behind force and gravity as you experiment with projectiles and counterweights to make the perfect launch.
ABOUT THE SCIENCE
The trebuchet (pronounced tray-boo-shay) was a large counter-weighted weapon used in the Middle Ages during warfare to break down the walls of castles. The first ones invented used between 15 and 40 men to pull down the lever arm in order to launch it. It soon developed into a simple machine called a traction trebuchet that used gravity instead of manpower. These machines were generally larger and more difficult to reload, but could catapult much bigger objects.
Here is how it worked! It had a lever that transferred gravitational energy into kinetic energy, taking the force of gravity and using it to fling an object. Soldiers relied on this weapon so much, that they even named them! One very large trebuchet used during the Crusades in Scotland was named “Warwolf”.
No matter the size, the main components of a trebuchet are the lever and the sling. The pivot point (or fulcrum) is located between the load and the effort and works like a see saw. On one end there is the object that is to be fired and on the other is the counterweight. Raising the counterweight above the ground causes a buildup of potential energy. When the counterweight is released and falls, the lever arm pivots on its fulcrum and the other end of the projectile receives the energy.
Can you believe they used these on ships as well as land? You can probably throw a ball on land with pretty good aim. Next time you are floating in a pool or lake, try throwing a ball to the shore and see what these ship-bound trebuchets were up against.
Today we’ll explore more about two of the three main types of materials that we use as engineers: metals and ceramics. We’ll discuss properties of metals, alloys, ceramics, clay, cement, and glass-ceramic materials. We’ll also look at the applications of our materials with microelectromechanical systems and accelerometers.
Just how small are nanomaterials? And what can we do with stuff that small? Today we’ll discuss some special properties of nanomaterials, how some can change at different sizes, and the difference between engineered nanomaterials and ones that occur naturally. We’ll also talk about some of the future research that’s needed on the use of nanomaterials.
PHYSICAL SCIENCE, TECHNOLOGY & INNOVATION, EARTH AND SPACE SCIENCE
Mission: Maple Leaf takes you on a journey across time and space! Save the Planet Tontar by helping Ed the Robot complete a series of puzzles by taking a trip through some of Canada’s greatest scientific and technological achievements. Given Canada’s vast and varied landscape, natural resources and diverse population, what can we teach the rest of the universe… and beyond?
ABOUT THE SCIENCE
What do computerised braille, the egg carton, pacemakers, AM radio, and snowmobiles have in common? They were all invented in Canada!
Thousands of years ago, Canada’s Indigenous community overcame the challenges of how to farm in Canada's climate and how to communicate and trade without a commonly spoken language. They created ways to travel across the landscape, medicines to keep healthy and even games, like the forerunner to lacrosse. As early European settlers came to Canada, they learned from the indigenous People and built upon their ingenuity across the fields of health/medicine, transportation, communications, and agriculture. Back in the Steam Age (1830-1880), Canadians helped to automate the harvesting of crops, and even invented the lightbulb. The Electric Age from 1880-1920 saw a number of world-changing innovations coming from Canadian soil such as the creation of early sonar and radio. The snowmobile, walkie-talkie and electric wheelchair were just some of the inventions of the Automobile Age (1920-1950). The Television Age in 1950-1980 saw Canada making strides in the fields of space exploration and in medicine. During and since the PC Age (1980-2000), computer programming, nanotechnology, high-tech agriculture and virtual reality have benefited from Canada’s expertise. Canadians young and old are still having an amazing and long lasting impact on the world. What’s next?
Mole Day occurs on October 23 and/or on June 2, once per semester! Take the opportunity to make the mole fun by celebrating.
On Mole Day, have a celebration, pledge allegiance to the mole, sings songs, show videos, and present what they did to earn the points, all while snacking on mole foods! Invite your administration, and have the students teach them about the mole and it’s applications in Chemistry.
Students will predict bond polarity using electron negativity values; indicate polarity with a polar arrow or partial charges; rank bonds in order of polarity; and predict molecular polarity using bond polarity and molecular shape.
Build your own system of heavenly bodies and watch the gravitational ballet. With this orbit simulator, you can set initial positions, velocities, and masses of 2, 3, or 4 bodies, and then see them orbit each other.
So, what happens to normal stuff (like water) when it goes to not so normal places? What happens if you take a glass of water to the top of Mt. Everest? Or Space? In this episode of Crash Course Kids, Sabrina shows us how matter is affected by different pressures and how that make water do some weird things.
Analyzing voltage and current in a circuit is a great place to start to understand what that circuit is doing. In this episode of “Adventures in Science,” we introduce the resistor and use it to help demonstrate Ohm’s Law.
This interesting law of physics was named after Georg Ohm, and states that the current between two points is directly proportional to the voltage across those two points: I = V/R
With a little bit of algebra, we can move the variables around and arrive at the more memorable: V = I x R
In the video, we demonstrate voltage and current in a fluid-based circuit, and show how a resistor acts like a piece of steel wool used to restrict the flow of water. We also construct a real circuit using a resistor, measure the voltage and current, and then calculate the resistance using Ohm’s Law.
Ever heard of Oobleck? How about Non-Newtonian fluids? Well, today Sabrina is going to show us that things can sometimes behave like a solid, and sometimes like a liquid depending on how much force is applied to them. In this episode of Crash Course Kids, we'll talk about some weird stuff that's still... normal.
This Crash Course Kids video reviews how substances can be organized into groups according to their various properties.
Do you want to be an astronaut? Would you like to someday walk on the moon? Well, you better learn a little about gravity so you can escape from Earth and head into space. In this video, Sabrina chats with us about what it takes to get to the moon!
In this episode, Sabrina talks to us about matter and particles and that all matter is made up of particles. Also, she shows us how matter can change states from a solid to a liquid, a liquid to a gas, a gas to a solid, or a liquid to a solid.
"Physical science, which encompasses chemistry and physics, deals with matter, energy and forces. Matter has structure, and its components interact. Energy links matter to gravitational, electromagnetic and nuclear forces in the universe. The conservation laws of mass and energy, momentum and charge are addressed in physical science.
This course combines elements of Chemistry 20 and Physics 20 in an integrated hands-on manner to investigate concepts related to heating and cooling, the foundations of chemistry, including the mole and quantitative analysis of molecules and chemical reactions, and the characteristics and properties of electromagnetic radiation. An overarching theme is the study of the enterprise of public and private science as it occurs in agriculture, industry, and universities to help students better understand the physical science related career paths. Student inquiry will guide independent investigations of physical science phenomena."