Gravitational Fields

Question 1

Gravitational field strength -g

Answer 1

g= weight / mass

Question 2

Fg - gravitational forces between two masses

Answer 2

Fg= Gm1m2/r^2
G= newtons gravitational constant
r= distance between two masses

Question 3

Time period - T

Answer 3

T^2= 4π^2r^3/ GM
M- Earth’s mass
r- distance from earth
G- gravitational constant

Question 4

g- gravitational field strength

Answer 4

g= GM/r^2

Question 5

Gravitational potential - phi

Answer 5

Phi = - GM/r

Question 6

Ep- gravitational potential energy

Answer 6

Ep-= -GMm/r

Question 7

change in GPE between two points

Answer 7

∆gpe = GMm ( 1/r1 - 1/r2 )
The change in GPE from an object of mass m at distance r1 from centre of M to distance r2 further away.