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.

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.
Longboard - A longboard is similar to a cruiser in terms of overall use and getting around town. Longboards start at about 42 inches in length and about 9 inches in width. When you buy a longboard, the wheel base of the trucks is usually wider and they have wheels starting at roughly 60mm. This gives you more maneuverability and a very smooth ride.
Bought as a Christmas gift for our nephew. He's not an expert or anything so I was looking for something that would work while he gets used to riding one. When I received it I pulled it out of the package to check it out and the construction was good. The wheels spun smoothly and the grip tape was nicely put on. I don't know how it would resist to some board slides but for a 15 year old just starting out its a good board.
This board is an excellent option for beginners because of its simplicity and durability. The lightly concave design allows for simple turns but doesn’t require the rider to be an excellent navigator. You can start off riding this deck down the street and use it as you learn ollies, kickflips and how to drop in to a half pipe. It will withstand it all and look good doing it. 
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