Track Field Training How to Increase Your Vertical Jump
Hi I'm Les Whitley. I'd like to take a fewminutes now and talk to you about how to improve your vertical jump. Your vertical jump isagain your ability to push force into the ground to propel your body upward overcomingthe forces of gravity, traveling upward through space. Knowing where you start or knowingwhere your vertical jump is to begin with is a great way to start. Once you identifywhat your vertical jump is usually measured in inches you know where you want to go andhow far you want to progress from as little as a gain of one inch up to three inches overthe course of a six to a twelve week time frame is actually a pretty good improvement.Putting force in the ground means that you
have got to get stronger, utilizing exercisessuch as the squat, to develop a good base of power for the lower body but then alsomaximizing the transfer of that power through incorporating exercises like the power cleanor the overhead snatch, the olympic movements which involve very speed oriented movementsto that you are maximizing that power output in minimal time. The vertical jump is a veryquick movement. You are putting maximal force in a very short amount of time. The otherthing becomes technique ideally setting yourself up as a spring, springing and loading yourselfup into a position, not to overcompensate by staying too long in a deep position sothat the muscles become taxed and fatigued.
You want to set yourself up by causing a nicespring effect swinging your arms down which preloads those muscles engaging the musclesof the hips, the muscles of the lower body, the calves and then forcefully swinging yourarms up high to again maximize that vertical leap so arms start up high, forceful drivedown and then rebound for maximal height.
Surprising Applications of the Magnus Effect
Recently some friends of mine went to the Gordon Dam in Tasmania, which is 126.5 meters (or 415 feet) high. Then they dropped a basketball over the edge. You can see that the basketball gets pushed around of it by the breeze but it lands basically right below where it was dropped. Now watch what happens when they drop another basketball, but this time with a bit of backspin. quot;Wow, where do that goéquot;
quot;That's incrediblequot; quot;This is right, and you threw up * I litterally just dropped that, with a bit of spin like I did have to throw, and it just took of, with no idea of what was gonna do that. And this is where I come in: the basketball was subject to the Magnus effect, which affects all rotating balls or cylinders as they fly to the air. It works like this:
as the basketball picks up speed, air on the front side of the ball is going in the same direction as its spin, and therefore it gets dragged along with the ball and deflected back. Air on the other side, is moving opposite to the ball spin so the flow separates from the ball instead of getting deflected. The net result is the ball pushes air one way, so the air applies an equal force on the ball the other way. And this is known as the Magnus effect,
named after Heinrich Gustav Magnus who described it in 1852. Of course, Isaac Newton beat into it by nearly two hundred years, describing a flight of tennisballs at Cambridge College. But, you know, he's got enough stuff named after him. This effect is very important in sports like tennis, soccer and golf, but could it have nonsports applicationsé Perhaps. This is a sailboat. I know it doesn't look like a sailboat
but those are chimneys. They are spinning cylinders called quot;Flettner rotorsquot;, and they take the place of the sails. They deflect crosswinds, using the Magnus effect to propel the ship forwards. And this is a plane with spinning cylinders instead of wings. Using the Magnus effect, the cylinders actually generate more lift than traditional wings. However they also generate way more drag, making them impractical. This place only flew once, and then it crashed.
But the Magnus effect is making a comeback. Here is an experimental rotor wing aircraft which generates all its lift from spinning cylinders. And this is the EShip 1 which uses four spinning cylinders (that's four Flattner rotors) to increase its efficiency and reduce the amount of diesel it burns. So, in the future, the Magnus effect may help more than just basketballs fly. Now the real reason my friends from quot;How Ridiculousquot; were at the dam was to set the world record for the highest basket ever scored. So go check out the channel and the tutorial,
Sports Car Aerodynamics Spoiler Alert
MUSIC PLAYING Say you like to draw. Specifically, say youlike to draw sports cars. What about thespoilers in the backé Do they impact thecar's performanceé Or are they there just for showé OK, say we have two cars now.
One has a spoiler,and one does not. If they were racing under thesame conditions, same engines, and same route, the one withthe spoiler would actually win. What if we add a thirdcar with an airfoilé Which one do you thinkwill win the race nowé Well, in order to understandthe differences that makes one car fasterthan the other, let's take a closer look atthe main forces, lift and drag,
that are acting on the car. Lift and drag are forcescreated as air flows around different shapes. Let's look at a cross sectionof an airfoil, or wing, to clearly show these effects. Air flows aroundthe wings smoothly, except at the tail end, wherethere is some swirling air. The smooth, steady airis called laminar flow,
while the swirling airis called turbulent flow. Laminar flow consists ofsmooth, parallel lines, while turbulent flowhas chaotic swirls. Pressure is defined asforce divided by area. However, since weare most concerned about the forcesof lift and drag, it's easier towrite the equation as force equalspressure times area.
Pressure differences betweentwo surfaces of an object creates a force goingfrom high to low pressure because the pressureswant to equalize. Let's identify the areasof high and low pressure. The air travelsfaster above the wing, creating an areaof low pressure. Conversely, slower airon the bottom of the wing creates a high pressure area.
The air flow above the airfoilseparates toward the back and creates turbulence,impacting lift and drag. Now that the high and lowpressure areas are labeled, it is easy to identify theforces of lift and drag. The high pressure area belowthe wing and low pressure area above it createsa force called lift. The high pressure areaat the front of the wing and a low pressurearea at the back