Kepler's Laws

Kepler's first law states that the orbits of the planets are oval in shape or 

• ellipses
• perfect circles

Kepler's 2nd Law deals with 

• the shape of the planets' orbits
• the speed/area the planet travels 
• the length of time it takes the planet to orbit the sun

A planet moves __________ when it is farthest from the sun.

• faster
• slower

The farther away a planet is from the sun, the _______ it takes it to orbit the sun once. 

• longer
• shorter

Planets farther away from the sun have a longer orbital period and travel slower because gravity is weaker.

• Kepler's 2nd Law
• Newton's 3rd Law
• Kepler's 3rd Law
• Newton's 3rd Law

If a planet is closer to the sun, its orbit will be _____ than one farther away. 

• longer
• slower
• bigger
• shorter

Kepler's 2nd Law states that a planet's velocity is ____ when farther from the sun.

• fastest
• slowest
• unchanged
• the same

T and r denote:

• T-orbital period, r= radius of orbit

• T-orbital period, r= Mass of the sun

• T-perimeter of orbit, r= radius of orbit

• T-orbital period, r= Gravitational force

Planets orbit the Sun in a shape called a(n)

• circle
• ellipse
• focus
• perihelion

According to Kepler's 3rd law, the square of the time it takes for an object to orbit, T, is directly related to the cube of the distance, r, between the object and what it is orbiting.    
What this means is that if a satellite moves away from what it is orbiting,

• the larger the constant k is.
• the smaller the constant k is.
• the longer the orbital period is.
• the shorter the orbital period is.