Module 5: Motion in Gravitational Fields

Question 1

Force of Gravity between two objects

Answer 1

F = G(Mass of 1)(Mass of 2) on r^2

Question 2

Gravity Field Strength

Answer 2

g = GM on r^2

Question 3

Kepler’s Law 1

Answer 3

v = 2piR on period

Question 4

Kepler’s Law 2

Answer 4

r^3 on period^2 = GM on 4pi^2

Question 5

Escape Velocity Formula

Answer 5

sqrt (2GM on r)

Question 6

Total Potential Energy of a planet/satellite in its orbit

Answer 6

U = - GMm on R

Question 7

Total Energy of a planet/satellite in its orbit

Answer 7

U + K = -GMm on 2R