אנסין באנגלית כיתה ט׳ · טקסט מידע
Never Lost Again? How GPS Works
טקסט מידע שמסביר איך הטלפון יודע איפה אנחנו נמצאים — לוויינים, אותות וחישוב מרחקים — ומה המגבלות של המערכת — אנסין באנגלית לכיתה ט׳.
נגעו בכל מילה לתרגום ולהשמעה · מילים עם קו מקווקו — ברשימת המילים המוסברות
1You open a map on your phone, and a little blue dot shows exactly where you are standing. It feels like magic, but it is actually the result of clever science and a lot of .
2GPS stands for Global Positioning System. It was developed by the United States, at first for use, and later it was opened to everyone. The system uses a group of that travel around the Earth, high above us. Each satellite sends out a that says, in effect, "This is where I am, and this is the exact time."
3Your phone does not send anything to the ; it only listens. Because the signals travel at a known speed, the phone can how far away each satellite is from the time it takes the to arrive. With signals from at least four , the phone can work out its position on the Earth.
4For this to work, timing must be incredibly accurate. That is why every satellite carries very atomic clocks. A tiny mistake in time would lead to a large mistake in distance.
5GPS is not perfect. Tall buildings, tunnels and thick forests can block or the signals, so the blue dot sometimes jumps around. Still, the system has changed our lives: it guides ships and planes, helps rescue teams find people, and makes sure the pizza delivery reaches the right door.
📘 Glossary — מילים מוסברות
- satellites — לוויינים
- military — צבאי
- constantly — כל הזמן
- signal — אות
- calculate — לחשב
- precise — מדויקים
- reflect — להחזיר (כמו מראה)
Questions
מטרה ומבנה
1. Why does the writer say "It feels like magic"?איתור מידע
2. What was GPS first developed for?איתור מידע
3. What information does each satellite send?איתור מידע
4. Which sentence about your phone is TRUE?הסקת מסקנות
5. How does the phone know how far away a satellite is?איתור מידע
6. Complete: The phone needs signals from at least ______ satellites.הסקת מסקנות
7. Why do the satellites carry atomic clocks?הפניה (למה המילה מתייחסת)
8. In paragraph 5, "the signals" are blocked by…איתור מידע
9. Write TWO ways GPS helps people, according to the last paragraph.רעיון מרכזי
10. What is the best title for paragraph 5?
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