Chapter 18: Gravitational Fields

Question 1

Newton’s law of gravitation definition

Answer 1

Any 2 point masses attract each other with a force that is directly proportional to the product of their masses and inversely proportional to the square of their separation

Question 2

Newton’s law of gravitation equation

Answer 2

F = Gmm/r

Question 3

G is equal to what

Answer 3

6.67 x 10^-11 N m^2 kg^-2

Question 4

Gravitational field strength g definition

Answer 4

The gravitational field strength at a point is the gravitational force exerted per unit mass on a small object placed at that point

Question 5

Gravitational field strength g

Answer 5

g = F / m 
F = GMm/r 
g= GM/r^2

Question 6

Energy in a gravitational field

Answer 6

gpe = mgh

Question 7

Gravitational potential definition

Answer 7

At a point is the work done per unit mass in bringing a mass from infinity to the point

Question 8

Gravitational potential (equation)

Answer 8

Symbol from Spider-Man = -GM/r

Question 9

Orbiting under gravity( full working)

Answer 9

F = mv^2/r
(GMm/r^2)/ mv^2/r
V^2 = GM/r

Question 10

Orbital period

Answer 10

v = C / T 
v = 2 Pi r/ T 
v ^2 
4 Pi ^2 r^2/ T^2 = GM/r 
T^2 = (4 Pi ^2/ GM)r ^3

Question 11

Orbiting the Earth

Answer 11

v^2 = GM/r