It's a neat piece of science art, and it also tells us something interesting. The arrows show us that the force on the skateboard is constantly changing, both in magnitude as well as in direction. Now the force of gravity obviously isn't changing, so the reason that these force arrows are shrinking and growing and tumbling around is that the skater is changing how their feet pushes and pulls against the board. By applying a variable force that changes both in strength and direction, they're steering the board.

In general an axle width should be chosen that is close to the width of the deck it will be used with.[8] For example, a 7.75" wide deck will usually be fitted with trucks that have axles between 7.5" wide and 8.0" wide. (Standard truck axle nut size is 5/16"-24tpi UNF, and the thinner "jam" style with an optional nylon lock.) Trucks that are too wide can make doing tricks difficult and can cause the wheels to get in the way when the skateboard is being ridden. Trucks that are too small can be hard to maintain stability and can cause wheel bite to occur when turning.
It’s not just standard deck sizes that are available for creating or replacing your board. You can just as easily get a great longboard deck to work on in your basement or garage. One of the best and best reviewed options out there is the Loaded Boards Poke Longboard Skateboard Deck. This standard-design longboard deck has it all to help you make the ideal board. 
The wheels of your skateboard can greatly affect your ride in numerous ways, such as the speed, your ability to take control of the skateboard’s movements, and what you feel while riding the board. The good news is that they come in various sizes, levels of durability, and colors, allowing you to pick one that suits your skateboard preference and style.
Pop the board in the air – The reason you jump up into the air in the first place is because you’re slamming the back end into the ground (don’t worry, your board is made to take the abuse). It’s the same motion you would do if you were standing near the board and wanted to pop the board up into your hands, except this time, you’re standing on top of it. As soon as you feel the board pop into the ground, kick your front foot up into the air at the same time. The timing on this is important: kick too early and you won’t go anywhere, kick too late and your board will fly out from underneath you.
I’m 31 and I just started skating too. I can ollie but they fluctuate a lot. I’ll do well certain day and certain day I won’t do well. It’s frustrating sometimes but I’m hooked. I go skating with my 5 year old son. He’s already practicing ollie. I think he’ll out do me soon. Man he picks up so fast like a sponge. Can’t wait till I can get all my basic tricks down so I can have more fun with them!
In 1978, Alan Gelfand, who was given his nickname "Ollie" by Scott Goodman, learned to perform no-handed aerials in bowls and pools using a gentle raising of the nose and scooping motion to keep the board with the feet.[2][3] There are numerous references to Alan Gelfand's Ollie with most notably pictures in the 1970s skateboarding magazine "Skateboarder".
Skateboards are for people who want to try something new and extreme.  If you have not given it a shot and you want to challenge yourself then you should try skateboarding.  It is a fact that there are certain risks that go along with skateboarding.  However, skateboarding can teach you to balance and it is also a great way of losing weight.  Skateboarding can also help you in making friends while you are in the park.  With skateboarding, you can learn perseverance and build confidence.
Skateboarding is the best and worst thing that’ll you’ll ever have the pleasure of tearing your hair out over. In a typical day of skating, you’ll get hurt, you’ll get incredibly frustrated, and eventually land a trick that’ll make it all worth it - if you’re lucky. Choosing a skateboard is fairly simple if you know what shape and width you like. If you’ve been skating awhile, you’re probably fairly familiar with what board brands you like skating. If not, there are a number of resources to help you choose the best skateboard for your skating style. Continuing to read this little spiel is going to take the least amount of effort on your part.
It is a mini-cruiser, which is known for its strength as well as its ability to offer real value for the money you spent. This skateboard can also be expected to deliver an impressive performance – thanks to the Abec 7 skatro bearings used in it. There are also 59-mm urethane wheels and the 3-inch GOLD aluminum trucks that can help smoothen each ride.
Both your height and weight should play an important role when you are choosing a skateboard. You need to find a skateboard, which fits your weight and height. Picking one, which is either too small or too big might only cause you to experience difficulty controlling it, especially if you are still a beginner learning the ins and outs of skateboarding.
It looks simple but yet complicated and vice versa. It takes most weeks to months to learn n some even years but a lifetime of effort to be consistent and be perfect at it and able to go higher, faster and further. It is not a feat you achieve once and it can be thrown out of the window if you want to continue to skate well. I've know skateboarders who just does ollies, boned ollies, ollie north and ollie souths, fakie ollies, switch ollies and nollies and nothing else but everytime he's popping them over 3ft height and up ledges, over gaps and down stair sets or over handrails. So no one's gonna argue on that even though he's not bustin some new fangled pressure flip late flip revert or something. He gets mad street creds for those huge ollies.
Skateboarding, in one form or another, has been around since the late 1950’s when the first brave pioneer first attached roller skate wheels to a piece of wood. As skateboarding progressed to mimic surfing, skateboards evolved with the style of riding. Skateboards grew and changed shapes as riders experimented with everything from plastic to fiberglass to aluminum constructions - all in an effort to push what was possible. Like most sports or art forms, progression is at the heart of skateboard innovation.
The wheels of a skateboard are usually made of polyurethane, and come in many different sizes and shapes to suit different types of skating. Larger diameters (55–85 mm) roll faster, and move more easily over cracks in pavement and are better for transition skateboarding. Smaller diameters (48–54 mm) keep the board closer to the ground, require less force to accelerate and produce a lower center of gravity which allows for a better response time, but also make for a slower top speed and are better for street skateboarding. Wheels also are available in a variety of hardnesses usually measured on the Shore durometer "A" scale. Again like car tires, wheels range from the very soft (about Shore A 75) to the very hard (about Shore A 101). As the A scale stops at 100, any wheels labeled 101A or higher are harder, but do not use the appropriate durometer scale. Some wheel manufacturers now use the "B" or "D" scales, which have a larger and more accurate range of hardness. Modern street skaters prefer medium-sized wheels (usually 51–54 mm), as small wheels with lighter trucks can make tricks like kickflips and other flip tricks easier by keeping the center of gravity of the skateboard closer to the deck, thus making the deck easier to spin. Street wheels are harder (A 100/A 101). Vertical ramp or "vert" skating requires larger wheels (usually 55–65 mm), as it involves higher speeds. Vert wheels are also usually slightly softer (A 98/ A 99), allowing them to maintain high speed on ramps without sliding. Slalom skating requires even larger wheels (60–75 mm) to sustain the highest speeds possible. They also need to be soft and have better grip to make the tight and frequent turns in slalom racing. Even larger wheels are used in longboarding and downhill skateboarding. Sizes range from 65 mm to 100 mm. These extreme sizes of wheels almost always have cores of hard plastic that can be made thinner and lighter than a solid polyurethane wheel. They are often used by skateboard videographers as well, as the large soft wheels allow for smooth and easy movement over any terrain. 
×