gravitational fields Flashcards
1
Q
State keplers first law
A
The orbit of a planet is an ellipse with the sun as one of the foci
2
Q
State Kepler’s 2nd law
A
A line segment joining a planet and the Sun sweeps out equal areas during equal intervals of time.
planets do not have constant speed in their orbits so if their orbit from X to Y has the same time interval as from Q to P then the areas of XY and QP are the same.
3
Q
State Kepler’s 3rd law
A
The square of the orbital period is directly proportional to the cube of the distance from the sun
