Download Objective – I can describe and explain the forces that keep objects in

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
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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
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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
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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
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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.
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