Kepler's 1st Law
The focus of the Earth's orbit is ....
The Sun
Formula associated with Kepler's 3rd Law
P squared = A cubed
Gravity can be described as....
An attraction between particles/objects
Which term refers to the movement of one object around another?
Revolve
All planets orbit in an ________ motion.
Elliptical
Kepler's 2nd Law says this...
A planet takes EQUAL time to carve out EQUAL areas with the line segment joining the sun.
In Kepler's 3rd Law equation, P stands for this and measures this.
P stands for period.
Time taken to orbit the Sun.
What 2 variables affect gravity?
Mass and Distance
As eccentricity approaches 0, you will get a more ___________ shape.
Circular
Draw: An ellipse with 2 foci and a major axis.
See board.
As a planet get's closer to the Sun, it's velocity...
Increases
In Kepler's 3rd Law equation, A stands for this and A is measures in this?
A stands for distance.
A is measured in astronomical units.
When the distance between 2 objects increases, the gravity....
Decreases
As eccentricity approaches 1, the shape of the orbit gets more __________.
Elongated (elliptical)
Eccentricity of Earth = 0.088
Which planet has a more circular orbit?
Earth
Solve for P when A is 10.
31.62 Earth Years
When the mass of 2 objects increases, the gravitational pull .....
Increases
Calculate eccentricity when ...
Major axis (d): 5
Focal length (f): 3
0.6
Solve for A when P is 10.
4.64 Astronomical Units
If the mass of Earth were cut in half....
A. would its velocity increase or decrease?
B. by how much?
A. decrease
B. by half
A planet is orbiting the Sun at a velocity of 20 meters per second. If the planet moves closer to the sun, what velocity would it be orbiting at?
Anything over 20 meters per second.