asteroids the total mass of all the asteroids is less than that of the moon. rocky objects with...
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Asteroids
The total mass of all the asteroids is less than that of the Moon.
rocky objects with round or irregular shapes
lie in a belt between Mars and Jupiter
Large balls of frozen ice and rock that areonly visible whenthey are close tothe sun
Pebble-sized particles that enter Earth’s atmosphere and burn up leaving a streak of light across the sky
My Very Educated Mother Just Served Us Nine Pies
Draw a line across the table between the terrestrial and jovian planets and label.
Which are more dense?Jovian or terrestrial
Which have more moons ?Jovian or terrestrial
Which have longer periods of revolution?Jovian or terrestrial
Which are larger in size on average ?Jovian or terrestrial
Which planet has the longest day?
Which planet has the longest year?
eccentricity website
Which planet has the least perfectly circular orbit?
Which planet has the most perfectly circular orbit?
Ms. WareEarth Science10/5/09
W.O.T.D.: Eccentricity: is a measure of how an orbit Deviates from circular. A perfectly circular orbit has an eccentricity of zero; higher numbers indicate more elliptical orbits
Do now: If a planet has a mostly oval orbit,Where do you think the planet wouldbe fastest? Why?
A
B
C
D
Sun
Calculate the eccentricity of the ellipse below:
Formula: eccentricity = distance between foci length of major axis
length of major axis
When furthestfrom Sun
When closestto Sun
eccentricity website
Area A=
Area B=
Area C
Explain the difference between the geo- and helio-centric
models of the solar system.
Earth-centered
Sun-centered
Introduction to planet project….
RATIOS and PROPORTIONS REVIEW
By: Teachers who care!
RATIOS & PROPORTIONS
• A ratio is a comparison of two numbers by division.
• To write ratios, use the word to, a colon, or a fraction bar.
EXAMPLE #1: John read 3 books in 4 days. Write the ratio of books to days.
Words: 3 to 4 Colon: 3:4 Fraction: 3/4
RATIOS & PROPORTIONS
• A proportion is a statement that two ratios are equal.
EXAMPLE#2: Is a proportion?15
6
5
2
Find the cross products.
65152 30 = 30 TRUEIf TRUE, the
statement is a proportion.
RATIOS & PROPORTIONS
EXAMPLE#3: Is a proportion?5
3
7
4
Find the cross products. 3754
20 = 21 FALSEIf FALSE, the
statement is NOT a proportion.
RATIOS & PROPORTIONS
EXAMPLE#4: Solve the proportion:10
4
5
Find the cross products. 4510 x
2010 x10 10
2x
Divide both sides by 10.
RATIOS & PROPORTIONS
There are 5 boys and 6 girls in Grant School.
1. What is the ratio of girls to boys using a fraction?5
6
2. What is the ratio of girls to children in Grant School (use a colon)? 6:11
3. What is the ratio of boys to children in Grant School (use words)?
5 to 11
RATIOS & PROPORTIONS
Are the following proportions?
7
3
9
4
20
9
9
4
27
12
9
4
18
8
9
4
3974 2728
FALSE – Not a proportion
99204 8180
FALSE – Not a proportion
129274 108108
TRUE – this is a proportion
89184 7272
TRUE – this is a proportion
RATIOS & PROPORTIONS
Find the missing numbers to make the following proportions.
21
93
9213 x
x963
x79 9
10
5
4
5410 x2010 x
10 10
2x
9
12
3
4
1
941 x36x
If John was 5 ft tall, and Jenny was 6 feet tall how would you
make miniature but proportional copies of them…
5ft= 10 inches 6ft = ??
HINT FOR PROJECT!!!!
SCALE DRAWINGS
• A scale drawing is a drawing of an object with dimensions proportional to those of the actual object. To find lengths from scale drawings, set up and solve proportions.
SCALE DRAWINGS USING PROPORTIONS
EXAMPLE#1: ¼ in = 5 ft is a scale for a rock band’s concert stage.
A. The scale length of the drum stand is 1 in. What is the actual length of the drum stand?
)(
)(
)(
)(
actualobject
drawingobject
ftactual
indrawing
x
1
5
25.
Cross multiply. 1525. x525. x
.25 .2520x
Divide by .25
SCALE DRAWINGS USING PROPORTIONS
EXAMPLE#2: ¼ in = 5 ft is a scale for a rock band’s concert stage.
B. The actual length of the stage is 60 ft. What is the scale length of the stage?
)(
)(
)(
)(
actualobject
drawingobject
ftactual
indrawing
605
25. x
Cross multiply. x 56025.x515
5 5x3
Divide by 5
SCALE DRAWINGS USING PROPORTIONS
Given a scale of ½ in = 4 ft, find the actual length for each scale length given.
x
75.2
4
5.
75.245. x115. x
.5 .5
ftx 22
in4
32 in5
x
5
4
5.
545. x205. x
.5 .5
ftx 40
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