Aim: What is Earth’s daily motion? DO NOW: 1. How many hours are in one day? 2. How many degrees...
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Transcript of Aim: What is Earth’s daily motion? DO NOW: 1. How many hours are in one day? 2. How many degrees...
![Page 1: Aim: What is Earth’s daily motion? DO NOW: 1. How many hours are in one day? 2. How many degrees is a full circle? 3. How many degrees does Earth spin.](https://reader035.fdocuments.in/reader035/viewer/2022081514/5697c0031a28abf838cc3e5e/html5/thumbnails/1.jpg)
Aim: What is Earth’s daily motion?DO NOW:1. How many hours are in one day?2. How many degrees is a full
circle?3. How many degrees does Earth
spin in one hour?4. What do hachure lines represent
on a topographic map?5. How can you tell there is a river
valley on a contour map?
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How does Earth move?
•Earth spins like a top as it travels in outer space. •This spinning is called ROTATION.•We say it spins about it’s axis.
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What is Earth’s rotational speed?Speed changes with latitude.
The Equator spins fastest because its wider.
The Poles; North and South, spin slowest because they are smaller.
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WHICH WAY DOES EARTH SPIN?
•Earth rotates in a compass direction of west to east or easterly.
•Clock direction of counterclockwise.
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How can we remember? Use the right hand rule!
Hold out your right hand in a thumbs up position: your fingers will be pointing counter-clock-wise.
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Why do celestial objects; such as stars, move in our sky?
Earth’s rotation creates the illusion that many celestial objects are moving.
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WHAT ARE CELESTIAL OBJECTS?
•Anything outside Earth’s atmosphere!•Ex: Stars, planets, comets, meteors, etc.
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What other effects does Earth’s rotational motion cause?
•1. The daily rising of the Sun in the east and setting in the west.
•2. The Sun’s apparent motion of 15o/hr from the east to the west.
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How many degrees will the Sun appear to move in 3 hours?
•3 hours x 150 •450
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What does the sun’s motion cause us?
3. The cyclic change from day to night.
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4. EARTH’S DAILY ROTATION CAUSES THE APPARENT MOTION
OF THE STARS.PROOF: CIRCULAR STAR TRAILS.
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Please observe this demonstration.
• 5. The Coriolis Effect; deflection or bending of winds. • a) To the right in the Northern Hemisphere • b) To the left in the Southern Hemisphere.
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WHY DO PLANES TRAVEL FASTER IN ONE DIRECTION VERSUS THE OTHER?6. The Jet Stream A strong planetary wind belt found in the upper atmosphere.
Their direction:Easterly or from west to east.
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What is the #1 piece of evidence that Earth Rotates?
• The best evidence is credited to Jean Foucault and his pendulum experiment.
• Foucault’s pendulum is a model still used today to demonstrate that Earth spins once on its axis over the course of a 24 hour period.
• Foucault Pendulum
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• If the pendulum is swung in a north to south direction, the pegs at 12 and 6 on the clock would be knocked down.
• As Earth rotates counterclockwise, the pendulum stays in a North South direction, but the face of the clock moves beneath it.
•Which pegs would be knocked over next?
• 1 & 7.
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Answer these please…
• List 2 of Earths motions
• Rotation (on axis) & Revolution (around Sun)
• How many degrees does Earth move in 1 hr?
• 15
• Which compass direction does Earth spin?
• Easterly or west to east
• Which way do winds deflect in the northern hemisphere?
• To the right
• What is the #1 pc of evidence that Earth rotates?
• Foucault pendulum!