IPC U6 Gravitational Fields

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

• circle
• ellipse
• focus
• perihelion

An ellipse is drawn around two points called

• aphelion
• perihelion
• foci
• axis

Where is the planet moving faster

• Position A to B
• Position B to C
• Position H to I
• Position I to J

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

The path a planet travels around the sun is called its 

• orbit
• ellipse
• barycenter
• precession

What does Kepler's 1st Law state? 

• all planets move in elliptical shaped orbits around the sun
• all ellipses have foci
• not all ellipses have the same eccentricity
• the sun is located at one of the foci

What does Kepler's 2nd Law state? 

• during a planet's orbit, the planet will sweep out equal areas in its orbit in equal amounts of time
• all areas are equal in space
• triangles have equal areas
• no two points in a planet's orbit are equal

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

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.