Busy. Please wait.

show password
Forgot Password?

Don't have an account?  Sign up 

Username is available taken
show password


Make sure to remember your password. If you forget it there is no way for StudyStack to send you a reset link. You would need to create a new account.

By signing up, I agree to StudyStack's Terms of Service and Privacy Policy.

Already a StudyStack user? Log In

Reset Password
Enter the associated with your account, and we'll email you a link to reset your password.

Remove ads
Don't know
remaining cards
To flip the current card, click it or press the Spacebar key.  To move the current card to one of the three colored boxes, click on the box.  You may also press the UP ARROW key to move the card to the "Know" box, the DOWN ARROW key to move the card to the "Don't know" box, or the RIGHT ARROW key to move the card to the Remaining box.  You may also click on the card displayed in any of the three boxes to bring that card back to the center.

Pass complete!

"Know" box contains:
Time elapsed:
restart all cards

Embed Code - If you would like this activity on your web page, copy the script below and paste it into your web page.

  Normal Size     Small Size show me how

Natty World

First Test

Eccentric Orbits with Equant Ptolemy
Epicycles and Eccentrics Ptolemy
Ptolemy's observations were standard for how long? 1,500 years
Perfect Celestial Spheres? Aristotle
Violent Motion? Aristotle
Copernicus model? Heliocentric
What was used against Copernicus? Parallax
Galileo used what for observations? Telescope
How did Copernicus explain Retrograde? 2 planets moving 2 different speeds
Indirect Vs. Direct observations (Galileo) Indirect: celestial spheres aren't perfect, Craters on the Moon, Rings/Ears of Saturn, Earth Leaves the Moon Behind Direct: Phases of Venus
Inclined Plane Galileo's attempt to measure free fall. Used bells and a pendulum on the incline to time the rate of acceleration. Found that there is a constant rate of acceleration no matter what the mass is. The speed at bottom is same no matter angle
Inertia Galileo - Proved by dropping ball down two angled ramps, ball returns to the same height no matter the distance. Just takes longer. Relates to earths rotation.
Created by: 604574680