Learning about Gear Ratios with LEGO Simple Machines (Highlights)

Key Takeaways

so at the start I'm going to teach you a little bit about years to go through some of the things we learned last week and also to build another very simple machine and then afterwards I'll give you guys some time to decorate and improve your machine to turn it into one of these okay of course this is an aeroplane this is a very special aeroplane an old aeroplane called a biplane okay and you know that it's called it's called a biplane it's like a bicycle bicycle means you have two wheels but why do you think we called it a biplane who wants to raise their hand and tell me why we call this a biplane if a bicycle has two wheels what does a biplane have excellent so it looks like everybody's ready so if you look at this we have now a big wheel and a small wheel so the difference with this gear to last week's gear system is that we have it something called a different gear ratio that means that when we are spinning one gear the other gear is not spinning at the same speed so these are very very useful for letting us change the speed of something like a racecar ok so that's something very very important and to do that we have to make sure that we put our driving gear has to be bigger than the driven year what happens if we swap the position of these two gears / oil it's much slower right fantastic bill very very good so the if we have a gear that is small the driving gear is small and the driven gear is large then what happens here is we do something called a gear reduction okay so before we were making it go faster but now we are making it go slower and a lot of people don't realize that when you're doing slower you're also making it those stronger as well so that is why not all gears about our about making it go faster and faster and faster and faster because when you're going slower you'll also increase the strength that you can feel free to decorate how you like your aeroplane to look here a couple of wings and also a propeller and remember if I want to prepare to move faster what do I do what do i do to make the propeller go faster who remembers what we do to make the propeller go faster now let's switch the gear that's right so we'll need to change this tiny little gear to a bigger gear so that will mean that you might have to shuffle your your design around so for me I'm gonna try and make it a bigger gear now so I'm going to move my wings are back a little bit gonna take off my handle take off my handle and then I'm trying to change this little gear into a big gear and Shalit is absolutely right because if I make it a bigger gear it's going to make it go faster so I need to take this whole thing off because otherwise I'll find it hard to take this clear out I need to change this little gear into a bigger gear maybe a big gear like this one but I back on you and then here we go make sure that it is meshing Ilya and all of a sudden whoa check that out moving much faster and that's all because just like what shall suggested I just changed the gear ratio I just made it a much higher gear ratio by making that small gear into a big year and now my plane is going to go much faster