Gravitational Fields

Question 1

What are the laws of gravity?

Answer 1

Mass makes gravity
The closer you are to the mass the stronger it is
Gravity is always attractive
Gravitational fields extend infinitely

Question 2

What are the units for gravitational field strength?

Answer 2

N/kg

Question 3

What are the units for GFS in SI units?

Answer 3

M/s2

Question 4

Equation for Fgrav

Answer 4

-Gm1m2/r2

Question 5

Equation for g

Answer 5

-GM/R2

Question 6

What is an ellipse?

Answer 6

The set of all points (x,y) in a plane such that the sum of their distances from two fixed points is a constant. Each fixed point is called the focus of the elipse

Question 7

What is keplers first law?

Answer 7

The orbit of a planet is an elipse with the sun at one of the two foci

Question 8

Keplers second floor

Answer 8

A line segment joining a planet and the sun sweeps out equal areas during equal intervals of time

Question 9

Keplers third law

Answer 9

T squared is proportional to r cubed

Question 10

Equation for keplers third law

Answer 10

4(pi)squaredx r cubed/GM = T squared

Question 11

What is a geostationary orbit?

Answer 11

Orbit around the equator that has a period of 24 hours
Moves at the same speed as the ground beneath it
Useful for communication

Question 12

What is a low polar orbit?

Answer 12

Low orbit
High speed
Orbital period of much less than a day e.g 1.5hours
Can be used for weather and environment monitoring.