Topic: Kepler’s Laws

Revolution Vs. Rotation

• Revolution =

Revolution Vs. Rotation

• Rotation =

ESRT pg 15

Laws of Gravity

• Mass – Greater mass =– As mass increases =>

• Distance – The closer the objects, the stronger the

gravitational forces.

Modern Celestial Models• Heliocentric Model could

not explain the movement of all objects, until Johannes Kepler (1609) developed laws of planetary motions

1st Law __

EccentricityA number indicating the roundness of

an ellipse.

Eccentricity = Distance Between Foci

Length of Major Axis

e=d/L Page 1 in your BEST FRIEND

e = 0 e = 1

Perfect circle

Straight line

ESRT pg 15

2nd Law__

Caused by the Sun’s gravitational pull

3rd Law• __

ESRT pg 15

Final Question

• http://www.polleverywhere.com/multiple_choice_polls/OTk2MDQ2MzY2/web