So, in order to prove that science is true and to show that those six steps Are really the best use of your time on the day of our big race. Here I decided to completely build a car from scratch in about 45 minutes and then take it at the Competition and see how it did so. The first thing I did would just make a single cut in this block of wood. So remember Aerodynamics are important, but there's no need to totally kill yourself on it. Just a simple reduced shape is good Okay, so the next step is polishing, the axle so here's a before and after Basically you just want to take your axle, put it in a drill, press or even a hand, drill and duct tape down the trigger, And then You just take different levels of sandpaper and just different water and put it on the nail Yeah you go all the way from you know, 600 mm Grit top online casinos usa.
The last step should be some sort of polishing compound. I put a link to another Youtube video that covers this in a lot more detail in the video description And then I went ahead and mark the 12 o'clock position on the nail head, and this is why So in doing research to talking with a bunch of Experts I actually found two things that dr. Acton didn't test: These are the concept of rail riding and the concept of bending your axles, So your wheels are canting. So, let's start with bending the axle so to bend the axles.
I use this bending tool from dirty work. So right there you just bend the nail, then you take it out of the clamp and then you have an axle. That'S been at exactly 2.5 Degrees.
So if you don't want to go to the hassle, you could actually buy pre bent and pre polished axles online. I put a link to where you can get them in the video description, So bent. Axles are important for two reasons. The first is that it reduces friction, And this is because, as you roll down the track to weigh the axles are bent the wheels want to migrate outwards And that's good, because it reduces friction in the sense that part. That'S rubbing is The wheel and the nail head, which has a much lower coefficient of friction than if the wheels just bouncing around Rubbing against the wooden body of the car.
The second reason They're really important is it makes alignment a hundred times easier, We'll get to that in a minute, and now I just put the wheels on the car - And this is a good time to apply the graphite just get it everywhere. You really can't over apply it and now because I'm going our car to only write on three wheels, I Deepen one side of the pre-cut axle groove in the front and now because it's deeper that front left wheel won't touch the ground. So Now you see, I am just pushing these axles. In my hand, I mean there are tools that sell for like ninety dollars that help you align them and people talk about drilling the hole is just Perpendicular, but it really doesn't matter if you're using cannon axles. You just kind of put them in the pre-made slots And then afterwards I just use a screwdriver just to make sure the nails were actually flush in each of those slots And it doesn't matter because with the cannon axles, you can align it later. So this is where it leaves us at the front and left wheels rates it up off the ground.
You can see the back two Wheels or can it outwards, but you notice the front wheel is actually candid the opposite Direction. This is the other thing drak that didn't look at, but it was called the rail righty technique. Now rail riding means you Intentionally steer your car into the rail that runs down the track and guides your car. Now That sounds crazy, like it's totally going to increase your friction and a lot of experts recommend spending Hours and hours on a line of your car, so it runs perfectly straight. So the problem with that is no track has a perfect surface, so even the Perfectly aligned car is going to bounce around on the track.
I didn't tell you the full story when it comes to kinetic Energy. So remember this is the energy of motion and when you cross the finish like technically, you have two types of motions your car is translating, but the wheels are also rotating about the axis now that gives us rotational kinetic energy. Now this green pile of Translating Kinetic energy is still the most important, because that represents your cars speed and this orange pile With spinning wheels actually takes away from that. So if we can minimize the moment of inertia on each of the wheels by making as light as possible Around the Edge, that means more of our initial potential energy will go into making our car go fast And not just spinning up the wheels with a lot Of energy, so when you high center at the end, the wheels are just spinning Forever: that's energy: We could have used to make our car Go fast, so the most streamlined pinewood derby car is going to be to normal block of wood by about 1.4 Car lengths And everything else is equal now, going back to our blocks, you're, not very aerodynamic.
It'S basically just a form of friction, so essentially the more streamlined your profile is the fewer air molecules. You basically have to push out of the way, So you don't have to kill yourself here. Making some attempt to make the car a little bit more streamlined in the standard block is Gon na be worth it using polished. Axles will be normal axles. By about one point, three car lengths everything else being equal.
I was actually surprised this wasn't a greater tribute to overall speed but drak around 35 trials of different Smoothness on the axles, and this is what the data show. Interestingly, grooved axles are a complete waste of time and money. If you look at the formula for Friction, it really just depends on the Two materials of the services, rub it together and sort of the weight at that surface. So, even if you reduce your surface area by a factor of two, the overall weight acting at those services is the same. So Nothing changes so lifting one wheel on your car, So your cars only riding on three wheels will be a four wheeled car.
By about one point, one car lengths Everything else being equal and most people say: oh it's one less wheel, that's 1/4! The friction, But for the reasons we talked about, that's not true, because each wheel just has more weight on and the real reason this actually helps Goes back to our rotational kinetic energy. Now remember, the green pile is what you want to maximize and if you have one less wheel to get spinning, as you start going down the ramp, that means that energy gets to go to our kinetic energy of Translation, which means the Faster velocity. At the finish line, Finally, adding graphic to your wheels and axles will make your car win by about point nine car lengths, Everything else be equal against the car that has no ground now.
There are several really expensive graphite solutions out there, but all the extra side pocket basically said Graphite, graphite, that's Clever marketing. Our independent tests show that there's really no appreciable difference between one versus another. So there's a number of other parameters, Dr Act and discusses in his videos, but those six are the ones that will have the biggest impact Relative at the time you spend on your car.
About Ten years ago, my son And I my wife's car out of the garage and we converted into the pinewood derby research facility for almost a year, we conducted experiments And use the laws of physics to determine exactly what takes make a winning pinewood derby race car. What I love about, Dr Acton, is that, instead of just making blind statements, like 99 % of the information you find out there, he used the Scientific method. Does all the possible parameters that go into building a pinewood derby car and then he documented the results. Okay, So what did he learn after year of testing, so here's a list of seven of the parameters he tested and how many car lengths You would win by if you're able to perfect that specific parameter, assuming everything else was the same. So the first thing you should notice is by far the biggest contributor to increasing the speed.
Your car is Maxing out the weight of your car at five ounces and then putting it in the right location towards the rear of the car. So that alone contributes to 36 % of the speedier car and you would be a car that had the worst possible mass placement location at the very front of the Car by almost five car lengths if everything else was identical between your two cars. So why is this?
Well, if you put all your weight toward the back of the car like this, when you're sitting on the track Before you even start, your center of mass is higher up Than if the weight was concentrated at the front of the car. That means you automatically start With more potential energy, and since energy is conservative, We added two blocks here. We have to add two blocks on the other side of the equation, which means you get more kinetic energy and again That's the energy of speed, which means you're going faster when you get to the bottom of the ramp. So another way to look at it is to say both cars will roll down the ramp at this same speed Until they get to the bottom.
Now, at this point, the blue car is done accelerating, But the red car has all the mass at the back and is still falling and will continue to be pushed forward sort of giving it a turbo boost when it gets to the platform. So now the question remains: how far back should The mass be placed? Now the mass is too Far back You're Gon na Pop a wheelie and be totally unstable and clearly that's bad.
So doctor act and ran trials on 40 cars and Concentrated the mass in different locations on the car, and this chart is an example of kind of data that he produced so somewhere around 0.9 to 1.5. Inches in front of the rear axle gives you the best times, So, if you want to narrow it down even more than that, it kind of depends on the shape your car, the doctor, actually went into more details into this in a video he made it's like 2 hours long, it details all the Results of his tests and even shows you like some tips and footage of how to actually fabricate the car. So we want a lot more detail than I'm giving here. I highly recommend you check it out. I put a link to it in the description of this video, So, let's quickly run through the remaining list of the critical parameters, light weighting wheels to give you a two car lengths, We'd everything else being equal. If your race rules allow, you need to take as much weight off this wheel as possible, especially the outer Edge or just buy some that are done for you, And I put a link of the video description of where you can get some now to explain why This Matters, let's go back to our blocks.
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Homeschooling history goes back a very long time. It is sometimes not easy for people who have grown up in a world where public schools are seen as the norm to realize that this has only been the case for a very short part of mankind's existence. Until the industrial revolution completely changed the way in which people live, there was very little education anywhere which was not performed at home. Certainly, there were no organized educational authorities demanding compulsory attendance. Even many of the children of rich families who were taught by an outsider were taught in their own homes.
The trend towards public education has been a relatively recent one, and the trend has now started, albeit in a small way, to reverse. There are many people who seriously doubt the value of public education, even though it has been an integral part of social planning throughout the last century. Obviously, there is a great deal of variation within the public education system, in terms of results, because however much you try to standardize the curriculum, there is still going to be a large element of individual input.
Homeschooling history really needs to be divided into two distinct sections. The section of time before the industrial revolution saw homeschooling as very much the standard practice across the whole of the Western world. The practice certainly proved adequate in allowing children to develop the skills they needed to qualify for a trade, earn a living, and keep their own family in turn. This trend only reversed with the sweeping changes brought by industrialization. All of a sudden, men were working together in a place separate from their home, and education began to follow the same pattern.
It can be hard to accept that the model of education to which we have all become accustomed is actually an extremist viewpoint, but that is what it is in reality. By passing compulsory school attendance laws, legislators were effectively doubting the ability of parents to provide for their own children. Yes, there will always be some children for whom homeschooling would never work. There are children with parents who would simply not be capable of providing homeschooling, there are children with abusive parents, and there are children with no parents at all. Clearly, these children need to be provided for, but to actively force all children into education outside the home is unwarranted.
The second part of homeschooling history is the part we are living through now, where we are seeing the inevitable reaction to the over swing of the trend towards public education. Parents who believe that they can do a better job of educating their children than the state system are beginning to assert their rights. The availability of the Internet and support groups has made the dissemination of information much easier, and that is a great help to homeschooling parents. We are potentially entering the most exciting period of time in homeschooling history.
Homeschool help can make the difference between you pushing through and overcoming a bad situation, or failing and falling by the wayside. There is no doubt that homeschooling is a tough assignment, and that it is going to take a lot of time and effort to make it work. It is strictly for dedicated parents who genuinely have the best interests of their children at heart. If you come into this category, you have a chance to make it work. You are still going to need support at some point, though, however dedicated you are.
The very first step you should take if you are considering homeschooling as an option is to familiarize yourself with the requirements of the local state educational authorities. These will not be incredibly strict or stringent, but they will need to be followed to the letter. Once you have read and studied these, you will be able to assess whether or not you think you can handle homeschooling. If the answer is yes, that is the time to begin looking for the right support group. Why leave it any later?
The support group you will find will be ideal in helping you to comply with the requirements. Every parent in the group, including the ones with far more experience than you, will all have to be able to submit the same records to the same authority. If you are part of a national Internet based group, there may be some differences in the exact nature of the requirements, but most of the fundamentals will be the same. In a local group, of course, everyone will have exactly the same reporting requirements.
Joining a supportive home school help group can also give you an insight into how other people teach their children. The imparting of information is an art form in itself, and very few people are naturals at it. The style you adopt should depend mainly on the learning needs of your pupil. There are some children who are studious by nature, and they will adjust well to being given written material and just left alone to absorb it. Most, however, will respond better to a more interactive form of learning and more personal involvement.
Finding a local homeschool help group should not be too difficult if you live in a major city with a large population, but it can be virtually impossible in rural areas. The first step is to perform an Internet search, both using a search engine and the catalog pages which list support groups in every area of the country. You can also find an online assignment writing service to order articles when you need. These should give you a contact for the local group. If there isn't one, don't worry. You can still get a lot of support through Internet forums and groups. The other possibility, if you know there are other homeschooling families in the area, is to start your own group for home school help