Pulling A Truck With A Flip Flop Winch.
Levers are all around us and within us, as the basic physical principles of the lever are what allow our tendons and muscles to move our limbs. Inside the body, the bones act as the beams and joints act as the fulcrums.
According to legend, Archimedes (287-212 B.C.E.) once famously said "Give me a place to stand, and I shall move the Earth with it" when he uncovered the physical principles behind the lever. While it would take a heck of a long lever to actually move the world, the statement is correct as a testament to the way it can confer a mechanical advantage. The famous quote is attributed to Archimedes by the later writer, Pappus of Alexandria. It's likely that Archimedes never actually ever said it. However, the physics of levers is very accurate.
When using a lever to perform work, we focus not on masses, but on the idea of exerting an input force on the lever (called the effort) and getting an output force (called the load or the resistance).
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a little throwback to chem last spring because I wanted to chat a little bit about school and my slightly weird schedule!
So I know it’s back to school season in *most* places, but I actually have a little less than a month to go until classes start back again, which I know is definitely not the norm. That’s due mostly to the fact that my school operates on a trimester system!
Basically, our school year is divided into three ten week terms, with the first taking place during “fall semester” and the other two taking place during “spring semester” (which means classes don’t end until mid-June).
Because my classes compress a semester’s worth of material into ten weeks, I only take three classes at a time. This allows me more time to focus heavily on each individual class, and also gives me more flexibility in when I take my premed prereqs—I can typically just take one at a time!
The last big perk of this is that I feel like it will be a good stepping stone towards the rapid pace of medical school. I’ve already adjusted pretty well to the quick pace and what it means is required of me outside of class, which I think will be helpful in terms of adjusting to another change of pace in med school!
The trimester system is one of many reasons I picked my school, another being small class sizes (which Cooper here is a good symbol of)—would you be interested in hearing about why I decided to go small? Let me know!
What are surfactants?
Most importantly, they're the superstar ingredients that make most cosmetic products possible - shampoos, conditioners, lotions, you name it. From a more technical standpoint, surfactants are ‘surface active agents’ ( hence their name); ultimately they’re able to reduce the surface tension of a solution. Stepping away from jargon, surfactants are ingredients that allow you to blend otherwise incompatible ingredients (e.g. fat-soluble and water-soluble), and to create a cleansing and foaming effect in your product. The reason for this comes down to their structure largely. Surfactants look a lot like sperm, they have a water-soluble (polar) head and a fat-soluble tail. When you have enough surfactant in your solution, they begin to move downwards into the water phase (usually) to create micelles - balls dispersed throughout the formula, often with their heads (water soluble) facing out and tails facing in (e.g. in an oil in water emulsion) - a fundamental component of surfactant-based product. •
Surfactants can come in negatively (anionic), positively (cationic), mixed (amphoteric) and uncharged (non-ionic), which play a big role for how they perform. For example, because your skin and hair also carry a negative charge, anionic surfactants are excellent cleansers. In contrast, cationic surfactants are much better able to condition/stick a bit... This is why cationic surfactants are most commonly used in hair conditioning products. Surfactants can be further catagorized into how they function. They can act as detergents/surfactants, your cold processed soaps (carboxylate salts), SLS, sci, etc. They can act as solubilizers - ingredients that allow things like essential oils to become soluble in water, very commonly polysorbates. Finally, they can act as emulsifiers - ingredients able to get water and oil to mix.
Want to learn more? Check out our surfactants basics blog post for some light science reading for your Sunday ✨👩🔬♥️. Link in bio to read!
Here's a shot of a cleanser product we've been developing, featuring our handy @ikaworldwide overhead mixer ✨♥️.
Este es un separador, a partir de ahora pondré otra edición y ángulo en las fotos 🥰 les dejo una frase que me gusto... "Somos un trozo de química adornada de cultura, si no existiera la cultura seriamos meros animales"