2.2 Grav Fields

Question 1

Features of geostationary satellites (5)

Answer 1

All Above equator at fixed height
Period of 24hrs
Remains in fixed position relative to earth
Same angular velocity as earth
Rotates in same direction as earth

Question 2

Grav field strength gfs

Answer 2

Gfs is equal to the force experienced per unit mass in N/kg (F=mg)

Question 3

Law of universal gravitation

Answer 3

Between 2 point masses there exists an attractive force which is directly proportional to the product of their masses and inversely proportional to the square of their separation
F = GMm/r^2

Question 4

What is the role of gravitational force in the orbit of planets

Answer 4

Provides centripetal force

Question 5

Keplers 3rd law

Answer 5

The square of their period of revolution is proportional to the cube of their mean distances, r, from it