Gravitational Fields

Question 1

The force of gravity between 2 point-masses

Answer 1

F = GMm/r^2 M is big mass m is smaller mass

Question 2

How can the gravitational field line be represented?

Answer 2

Line of Equipotential
The closer to the point mass the lower the equipotential ( -ves)
infinite distance away is 0

Question 3

How to find g?

Answer 3

g = GM/r^2
where M is the object generating gravity (planet, star etc)

Question 4

What is gravitational potential [ V(grav) ]?

Answer 4

The work done in moving a unit mass from infinity to a point
V(grav) = -GM/r
where M is the object generating gravity (planet, star etc)