Wind blowing across water causes friction on the surface, forming small ripples perpendicular to the direction of the wind. There are many ways to tell the direction of the wind. ![]() When you're sailing, it's important to be aware of the strength and direction of the wind in order to harness its energy efficiently and sail safely. The wind itself is invisible, but its effects are not. Depending on the surfaces it passes over, the stability or instability of the air, weather systems, and even the effects of other boats, the wind is constantly changing in both strength and direction. Wind will blow more strongly out of valleys and will be almost nonexistent on the leeward side of a high hill. It flows over and around obstructions, seeking the path of least resistance. While air is made up of gasses, in many ways it behaves like a liquid. Wind is the movement of air from areas of high pressure to areas of low pressure. As you gradually head up, turning toward the wind, you will need to trim your sails to keep them from luffing (flapping in the wind) as you sail onto a broad reach, then a beam reach, close reach, and finally back up to close-hauled. If you continue to turn, you will gybe, so that you are on a run with your sails on the opposite side of the boat. When you are sailing directly away from the wind, you are sailing on a run with your sails eased all the way out. As you bear off, steering away from the wind, you will ease your sails as you sail onto a close reach, then a beam reach (where the wind is blowing over the side, or beam, of the boat), then a broad reach. When sailing as close to the wind as possible, with the sails trimmed in all the way, you are close-hauled or beating. Different angles of sail, called points of sail, change as your boat changes course, and the sails must be adjusted to harness the wind as efficiently as possible. The angle of the sail is the difference between the direction your boat is heading and the direction of the wind. If you get too far out of position, you could unbalance the boat and cause a capsize. Since centerboard boats don't have heavy keels, the crew must use their weight to counteract the heeling forces. As the boat heels, the weight of the keel pulls back down. ![]() Keelboats have a heavy concentration of weight, usually lead, in their keels. The combination of these forces pushes the boat forward.įorm stability and ballast keep a sailboat from tipping over sideways (capsizing). The flow of water over the underwater surfaces creates lift, too-a sideways force countering the force of the wind. Physics 101 contains 40 hours of lab work! These labs are designed to keep your student engaged in the inner working of what they are learning.A sailboat would slide sideways with the wind if it did not have a centerboard or keel underneath the hull. Included on Disc D is a printable (digital PDF) Guidebook with quizzes covering the material presented in each segment and a one-year high school Course Booklet. ![]() This 4 DVD set contains 20 individual, 20-45 minute segments examining the world of Physics. This DVD course will give your children a thorough overview of the world of Physics. Wes guides you through the science of physics untangling and decoding complex terms and ideas into an organized and easy to use format. Physics 101 was developed and hosted by Wes Olson, Multnomah School of the Bible graduate (now Multnomah University), veteran filmmaker of 20 years, and producer of Biology and Chemistry 101. Each guidebook segment includes a multiple-choice quiz and discussion questions. The guidebook allows the student to easily review all the information covered in the films. Included on Disc D is a printable (digital PDF) guidebook with quizzes covering the material presented in each segment and a one-year high school course booklet. With over eleven hours of information packed into four DVDs, this series presents everyone with a rich opportunity to study the clockwork of God's universe. Once you have finished this course, you will feel at ease discussing relativity, explaining the correlation between energy, mass and the speed of light, and perhaps even Schrodinger's cat.Įxplore the fascinating science of physics and study the principles and laws that drive the natural world. ![]() Veteran filmmaker Wes Olson will take you on a journey into the incredible universe created by God, from Newton's laws to the complex concepts behind quantum mechanics. Physics can be a complicated subject, but that doesn't mean that it must be boring and impossible to understand.
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