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Foucault Pendulum in the Science Garden
Description
The Foucault pendulum is one of the most spectacular and significant experiments in the history of science, providing undeniable visual proof that the Earth rotates on its axis. In this video, we observe a pendulum situated in the Science Garden, demonstrating in a simple and mesmerizing way the physical principle discovered by French physicist Léon Foucault in 1851. While the pendulum appears to change its direction of motion over time, the reality is that it continues to swing in the exact same plane; it is actually the Earth—and us along with it—rotating beneath it. The history of the experiment takes us back to the mid-19th century, when Foucault first presented the pendulum at the Panthéon in Paris. Using a 67-meter cable and a heavy bronze bob, he proved to the world what had previously been known only through complex astronomical calculations. The uniqueness of the Foucault pendulum lies in the law of inertia: an object in motion tends to maintain its original direction in space. Because the pendulum is attached to the ceiling via a swivel joint that allows total freedom of movement, it remains faithful to its original plane of oscillation while the floor and the entire building move with the Earth's rotation. The pendulum's apparent rate of rotation depends on its latitude. If we were to place the pendulum at the North or South Pole, it would complete a full 360-degree rotation in exactly 24 hours. Conversely, at the equator, the pendulum would not change its direction relative to the ground at all. In Israel, located at approximately 32 degrees north latitude, the pendulum completes its circle at a slower pace, allowing visitors to the Science Garden to track the gradual shift throughout the day. Watching the pendulum at the Science Garden is an educational experience that blends physics, astronomy, and history. It is a tool that illustrates how "apparent" forces, such as the Coriolis effect, influence our world—from the path of the pendulum to the rotation of hurricanes and the movement of atmospheric currents. This video invites you to pause for a moment, observe the rhythmic oscillation, and realize that even when we feel perfectly stationary, we are on a constant celestial journey around the Earth's axis.
Original title
מטוטלת פוקו בגן המדע
מטוטלת פוקו היא אחד הניסויים המרהיבים והחשובים ביותר בתולדות המדע, שכן היא מספקת הוכחה ויזואלית ובלתי ניתנת לערעור לכך שכדור הארץ מסתובב סביב צירו. בסרטון זה, אנו זוכים לצפות במטוטלת המוצבת בגן המדע, המדגימה בצורה פשוטה ומהפנטת את העיקרון הפיזיקלי שגילה הפיזיקאי הצרפתי לאון פוקו בשנת 1851. בעוד שהמטוטלת נראית כמשנה את כיוון התנועה שלה לאורך זמן, המציאות היא שהמטוטלת ממשיכה להתנודד באותו מישור בדיוק, וזהו למעשה כדור הארץ – ואנחנו יחד איתו – שמסתובב מתחתיה. ההיסטוריה של הניסוי מחזירה אותנו לאמצע המאה ה-19, כאשר פוקו הציג את המטוטלת לראשונה בפנתיאון בפריז. הוא השתמש בכבל באורך 67 מטרים ובמשקולת ברונזה כבדה כדי להוכיח לעולם את מה שהיה ידוע עד אז רק דרך חישובים אסטרונומיים מורכבים. הייחוד במטוטלת פוקו הוא שהיא פועלת בהתאם לחוקי ההתמדה (אינרציה): גוף בתנועה שואף לשמור על כיוונו המקורי בחלל. מכיוון שהמטוטלת מחוברת לתקרה באמצעות ציר כדורי המאפשר לה חופש תנועה מוחלט, היא נשארת נאמנה למישור התנועה המקורי שלה בזמן שהרצפה והבניין כולו נעים עם סיבוב כדור הארץ. קצב הסיבוב הנראה של המטוטלת תלוי בקו הרוחב שבו היא נמצאת. אילו היינו מציבים את המטוטלת בקוטב הצפוני או הדרומי, היא הייתה משלימה סיבוב מלא של 360 מעלות ב-24 שעות בדיוק. לעומת זאת, בקו המשווה המטוטלת לא תשנה את כיוונה כלל ביחס לקרקע. בישראל, הנמצאת בערך בקו רוחב 32 מעלות צפון, המטוטלת משלימה מעגל בקצב איטי יותר, מה שמאפשר למבקרים בגן המדע לעקוב אחרי השינוי ההדרגתי לאורך שעות היום. הצפייה במטוטלת בגן המדע היא חוויה לימודית המשלבת פיזיקה, אסטרונומיה והיסטוריה. זהו כלי הממחיש כיצד כוחות "מדומים" כמו כוח קוריוליס משפיעים על עולמנו, החל ממסלול המטוטלת ועד לכיוון הסיבוב של סופות הוריקן ותנועת זרמי האוויר באטמוספירה. הסרטון מזמין אתכם לעצור לרגע, להתבונן בתנודה הקצובה, ולהבין שגם כשאנחנו מרגישים יציבים לחלוטין, אנחנו נמצאים במסע חללי בלתי פוסק סביב ציר כדור הארץ.
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