Gravity Review Gide

Gravity Review Gide

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.

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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.

Weight on Earth Weight on Jupiter

Here is how you would calculate your weight on the Sun and other planets.

Sun
X 27
Planet / Mercury / Venus / Earth / Mars
Multiply weight on Earth by / x .38 / x .86 / x 1 / x .38
Planet / Jupiter / Saturn / Uranus / Neptune
Multiply weight on Earth by / x 2.87 / x 1.32 / x.93 / x1.23

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
If you weigh 100 pounds on Earth / 38 / 86 / 100 / 38
Planet / Jupiter / Saturn / Uranus / Neptune
If you weigh 100 pounds on Earth / 287 / 132 / 93 / 123

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.
  • It’s year is shorter.

Planet / Distance from Sun (miles) / “Year” / 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

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.
  • It’s year is longer.

Planet / Distance from Sun (miles) / “Year” / 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

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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.

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