Wooh! 100 Followers!
Huge thank you to all our followers! I've been waiting to reach this follower benchmark to start posting DIY engineering projects, so check back this weekend for some awesome content!
We're always looking for content from the community, so don't hesitate to tag us in your engineering-related posts!
Future posts: I've been wanting to write about robotics, but it's such a large field that I've decided to break it down into a various posts. I will also do this from a DIY robotics perspective for those who are looking for a hobby. I'm currently also working with some friends on building an electric go kart, so expect some content on electric motors (AC induction), micro controllers, variable frequency drives, and basic mechanics.
Speaking of basic mechanics, did you know that your car jack and water gun are just inverse versions of each other?
They both work on Pascal's Law (not to be confused with Pascal's Wager, there's probably a philosophy community to discuss that one). Basically, Pascal's Law tells us that pressure applied to a liquid will be distributed equally. Sounds like common sense, right? So why is it special? Because this means that we with the right mechanism, we can apply little force to get a lot of, or vice versa.
Think about the water gun: (gif source)
Let's say that the bigger chamber contains 1 cubic inch of water, and you push the trigger at 1 cubic inch per second. Now let's say that the smaller tube is 10 times smaller. So the water would shoot out 10 times faster, at 10 cubic inches per second. Because mass stays constant, we know that Force increased by a factor of 10.
The same principle applies in reverse, like a car jack or machinery hydraulics. Like shown in the image below:
The amount of pressure applied to Piston A will be multiplied in Piston B. This is how car jacks translate human strength into a car-lifting mechanism. However, there is no free lunch, and as shown by the blue arrows above, Piston A must move considerably further than Piston B.