Gravitation Flashcards
1
Q
Gravitational field strength at a point equation
A
g=F/m
2
Q
Newton’s law of gravitation(force between 2 points)
A
Gm1m2/r^2
G: Gravitation constant
r: distance between 2 centres
3
Q
Speed of satellite equation
A
Equate Gravitational force to centripetal force
v^2=GM/r
M: mass of earth
m: mass of satellite not needed
4
Q
Kepler’s 3rd law
A
T^2 proportional to r^2
T: Time period to travel circumference of orbit
5
Q
Graph of g against R
A
r < R g is directly proportional to r
r > R g is inversely proportional to r^2
6
Q
gravitational potential equation
A
ø=-GM/r
7
Q
gravitational potential energy equation
A
Ep=-GMm/r
