Lecture 5 G. Bare Bones Physics Study Sheet

0. Galileo: Neglecting air resistance, light & heavy objects of fall at same speed on Earth.

1. Newton's First Law: change in an object's direction or speed means a force is acting on that object.

2. Newton's Second Law: more force is required to alter a more massive object's motion the same amount.

3. Newton's Third Law: forces always come in equal and opposite pairs.

4. Gravity: F = G x M1 x M2 / R2

5. Angular momentum is conserved.

6. Kepler's First: Planets' orbits are ellipses.

7. Kepler's Second: Line from Sun to planet sweeps out equal areas in equal times.

8. Kepler's Third: (period)^2 = (distance)^3