Survey
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Objective – I can describe and explain the forces that keep objects in orbit in the Solar System. Gravity Review Gide I. I can describe gravity. Gravity is an attractive force. Gravity pulls objects towards it. Anything made of matter has gravity. The Earth is made of matter. It has gravity. The Earth’s gravity is pulling you towards the center of the Earth. The gravitational force of an object depends on its mass. The more mass an object has, the stronger its gravitational pull. The opposite is also true. The smaller the mass of the object, the weaker its gravitational pull. The Sun has 99.8% of the mass of the Solar System. Its gravitation pull is so strong that it keeps planets and other objects revolving around it. Comets revolve around the Sun 6,000,000,000,000 (trillion) miles away! II. I can determine my weight on other planets. Your weight depends on the mass of the planet on which you are standing. If you were standing on the Moon, you would weigh 16% of your weight on Earth. This means the Moon has less mass than the Earth. If you weighed 100 pounds on Earth, you would weigh 16 pounds on the Moon. If you were able to stand on a surface of Jupiter (it has no real surface!), you would weigh 2.4 times your weight on Earth. If you weighed 100 pounds on Earth, you would weigh 240 pounds on Jupiter. 100 240 Weight on Earth Weight on Jupiter ~1~ Objective – I can describe and explain the forces that keep objects in orbit in the Solar System. Here is how you would calculate your weight on the Sun and other planets. Sun X 27 Planet Mercury Venus Earth Mars x .38 x .86 x1 x .38 Jupiter Saturn Uranus Neptune x 2.87 x 1.32 x.93 x1.23 Multiply weight on Earth by Planet Multiply weight on Earth by Here is how much you would weigh on the Sun and other planets. Sun If you weighed 100 pounds on Earth – 2,700 pounds Planet Mercury Venus Earth Mars 38 86 100 38 Jupiter Saturn Uranus Neptune 287 132 93 123 If you weigh 100 pounds on Earth Planet If you weigh 100 pounds on Earth Weight on Other Planets if You Weighed 100 Pounds on Earth 287 300 Weight 250 200 150 100 50 86 38 132 100 93 123 38 0 ~2~ Objective – I can describe and explain the forces that keep objects in orbit in the Solar System. III. I can explain why the farther from the Sun, the longer the planet’s year. The closer a planet is from the Sun, the faster it revolves It moves faster to keep from being pulled into the Sun. It travels a shorter distance around the Sun. o It’s year is shorter. Planet Distance from “Year” Sun (miles) Distance traveled around the Sun (miles) (estimated) Mercury 36,000,000 88 days 226,194,671 Venus 67,200,000 225 days 422,230,052 Earth 93,000,000 1 years 584,336,233 Mars 141,600,000 1.9 years 889,699,039 Distance from Sun & Length of Year (Rocky Planets) 160,000,000 141,600,000 140,000,000 Distance to Sun 120,000,000 93,000,000 100,000,000 67,200,000 80,000,000 60,000,000 36,000,000 40,000,000 20,000,000 0 "Year" 88 days Mercury 225 days 1 years 1.9 years Venus Earth Mars ~3~ Objective – I can describe and explain the forces that keep objects in orbit in the Solar System. The farther a planet is from the Sun, the slower it revolves It moves slower to keep from being pulled into the Sun. It travels a longer distance around the Sun. o It’s year is longer. Planet Distance from “Year” Sun (miles) Distance traveled around the Sun (miles) (estimated) Jupiter 483,800,000 12 years 3,039,805,051 Saturn 890,800,000 29 years 5.597.061.471 Uranus 1,784,800,000 84 years 11,214,229,136 Neptune 2,793,100,000 164 years 17,549,564,881 Distance from Sun (miles) - Gas Giants 2,793,100,00 0 3,000,000,000 Distance to Sun 2,500,000,000 1,784,800,00 0 2,000,000,000 1,500,000,000 1,000,000,000 500,000,000 890,800,000 483,800,000 0 ~4~ Objective – I can describe and explain the forces that keep objects in orbit in the Solar System. Length of Year - Gas Giants 200 164 Years 150 84 100 50 12 29 0 Jupiter Saturn Uranus Neptune IV. I can correctly define and use unit vocabulary. Force – A push or a pull. Gravity – The power that attracts one object to another. Gravitational Force – The pull that gravity has on an object. ~5~