The Earth And The Solar System (continued 2)
Akopọ
The Sun holds more than 99 percent of the mass of the Solar System, and that vast mass is what keeps eight planets, countless asteroids and long-tailed comets sweeping around it. The same gravity that gives you weight on Earth reaches across hundreds of millions of kilometres to hold whole worlds in orbit.
In this topic you will learn what controls a planet's gravitational field strength, calculate how long light takes to cross the Solar System, and see why the Sun's gravity keeps the planets in orbit. You will also explore how orbital speed changes with distance from the Sun and use conservation of energy to explain why a comet races when it is close to the Sun.
Awọn Afojusun
- Know that the strength of the gravitational field (a) at the surface of a planet depends on the mass of the planet (b) around a planet decreases as the distance from the planet increases
- Calculate the time it takes light to travel a significant distance such as between objects in the Solar System
- Know that the Sun contains most of the mass of the Solar System and this explains why the planets orbit the Sun
- Know that the force that keeps an object in orbit around the Sun is the gravitational attraction of the Sun
- [Supplement] Know that the strength of the Sun’s gravitational field decreases and that the orbital speeds of the planets decrease as the distance from the Sun increases
- [Supplement] Know that an object in an elliptical orbit travels faster when closer to the Sun and explain this using the conservation of energy
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Àwòrán ọpọlọ
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Káàdì ìrántí
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Ṣe ìdánrawò káàdì wọ̀nyí nínú áàpù
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Ìdánwò Ẹ̀kọ́
Oriire fun ipari ẹkọ lori The Earth And The Solar System (continued 2). Ni bayi ti o ti ṣawari naa awọn imọran bọtini ati awọn imọran, o to akoko lati fi imọ rẹ si idanwo. Ẹka yii nfunni ni ọpọlọpọ awọn adaṣe awọn ibeere ti a ṣe lati fun oye rẹ lokun ati ṣe iranlọwọ fun ọ lati ṣe iwọn oye ohun elo naa.
Iwọ yoo pade adalu awọn iru ibeere, pẹlu awọn ibeere olumulo pupọ, awọn ibeere idahun kukuru, ati awọn ibeere iwe kikọ. Gbogbo ibeere kọọkan ni a ṣe pẹlu iṣaro lati ṣe ayẹwo awọn ẹya oriṣiriṣi ti imọ rẹ ati awọn ogbon ironu pataki.
Lo ise abala yii gege bi anfaani lati mu oye re lori koko-ọrọ naa lagbara ati lati ṣe idanimọ eyikeyi agbegbe ti o le nilo afikun ikẹkọ. Maṣe jẹ ki awọn italaya eyikeyi ti o ba pade da ọ lójú; dipo, wo wọn gẹgẹ bi awọn anfaani fun idagbasoke ati ilọsiwaju.
- The gravitational field strength at the surface of a planet depends on the planet's: A. colour B. mass C. number of moons D. temperature Answer: B
- Light takes about how long to travel from the Sun to the Earth? A. 8 seconds B. 8 minutes C. 8 hours D. 8 days Answer: B
- The planets orbit the Sun because of: A. magnetic attraction B. the Sun's gravitational attraction C. the solar wind D. air resistance Answer: B
- As distance from the Sun increases, the orbital speed of a planet: A. increases B. decreases C. stays the same D. becomes zero Answer: B
- A comet in an elliptical orbit moves fastest when it is: A. farthest from the Sun B. closest to the Sun C. at constant distance D. outside the Solar System Answer: B
Ṣiṣẹ́ lórí àwọn ìbéèrè wọ̀nyí nínú ohun èlò náà
Ṣiṣẹ́ lórí àwọn ìbéèrè wọ̀nyí nínú ohun èlò náà
Awọn Iwe Itọsọna Ti a Gba Nimọran
Ẹ̀kọ́ síwájú láti àwọn orísun ṣíṣí
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Abala ìwé ẹ̀kọ́
Newton’s Universal Law of Gravitation
What do aching feet, a falling apple, and the orbit of the Moon have in common? Each is caused by the gravitational force. Our feet are strained by supporting our weight—the force of Earth’s gravity on us. An apple falls from a tree because of the same force acting a few meters above Earth’s surface
"College Physics: Newton’s Universal Law of Gravitation" by OpenStax, OpenStax, Rice University, licensed under CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/). Source: https://openstax.org/books/college-physics/pages/6-5-newtons-universal-law-of-gravitation. Access for free at https://openstax.org/books/college-physics/pages/1-introduction
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Abala ìwé ẹ̀kọ́
Satellites and Kepler’s Laws: An Argument for Simplicity
Examples of gravitational orbits abound. Hundreds of artificial satellites orbit Earth together with thousands of pieces of debris. The Moon’s orbit about Earth has intrigued humans from time immemorial. The orbits of planets, asteroids, meteors, and comets about the Sun are no less interesting. If
"College Physics: Satellites and Kepler’s Laws: An Argument for Simplicity" by OpenStax, OpenStax, Rice University, licensed under CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/). Source: https://openstax.org/books/college-physics/pages/6-6-satellites-and-keplers-laws-an-argument-for-simplicity. Access for free at https://openstax.org/books/college-physics/pages/1-introduction
Àwọn àjọ mìíràn ló tẹ̀ wọ́n jáde lábẹ́ ìwé àṣẹ ṣíṣí, a sì dá wọn lọ́lá bí wọ́n ṣe béèrè. Àwọn ìjápọ̀ ń ṣí ojú òpó wọn.
Ṣe Adaṣe Awọn Ibeere Idanwo Adaṣe
Ṣe o fẹ ṣe adaṣe awọn ibeere idanwo adaṣe nipa The Earth And The Solar System (continued 2)? Ṣe igbasilẹ ohun elo Green Bridge CBT lati wọle si awọn ibeere idanwo adaṣe ati awọn ayẹwo adaṣe kikun fun koko-ọrọ yii.
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