7.1 Orbits

mnemonic

my very expensive michael jackson slapped ur nuts

thus the 8 planets are

mercury venus earth mars jupiter saturn uranus neptune

Earth
> rotates on its a__ (tilted __° from vertical) once per __hrs & orbits the Sun in __days
> rotates __ → __, so the Sun/Moon rise in __ & set in __

axis, 23.5, 24, 365, W, E, E, W

Seasons
> caused by t__ & e__ orbit of Earth around the Sun

tilt, elliptical

Avg orbital speed formula
v = 

2pir/T

in the avg orbital speed formula,
r is the radius of the orbit from the

centre

Elliptical orbits
Ø  Planets/dwarfs/comets have e__ orbits around the Sun
Ø  The Sun isn’t the c__ of the ellipse (except when circular)
Ø  Closer to Sun = p__
Ø Farther from Sun = a__
>> dist between these 2 = eccentricity
>> incr. eccentric orbit = incr. o__ shape

elliptical, centre, perihelion, aphelion, oval

G__ f__ keeps planets in o__ around the Sun

gravitational force, orbit

C__ to Sun = s__ pull & f__ orbit &↑E_ &↓E_ , vice versa

closer, stronger, faster, k, p

Total e__ of a planet in orbit is always c__, so faster = closer, vice versa (LoCoE)

energy, constant

Gravitational field
> region of s__ where a mass experiences a f__ bc of the grav. attr. of another m__
> direction always towards __ of mass causing field
> has i__ range

space, force, mass, centre, infinite

Gravitational field strength
> g = __ (N/kg)
> i.e. w__ formula

F/m, weight