Kepler's Laws
Variables/ Units
Vocab
Formulas
Practice Problems
100
This value describes the measure of "un-circle-likeness" an object's orbit.
What is eccentricity?
100
This value, T, represents the amount of time an object takes to complete one revolution.
What is period?
100
This value, often measured in kg, remains constant regardless of an object's location.
What is mass?
100
The weight of an object can be calculated using this formula.
What is F = ma?
100
Kepler's constant for Jupiter if Europa, one of Jupiter's moons completes one revolution in 3.07 x 105 seconds and is, on average, 4.2 x 108 m away from Jupiter.
What is 3.13 x 10-16 s2/m3?
200
This law explains why planets move faster when they are closer to the sun.
What is Kepler's 2nd Law?
200
Astronomical units (AU) are appropriate to measure these values.
What are distances?
200
This force acts as a centripetal force to keep the planets in orbit around the sun.
What is gravity?
200
This formula is appropriate when calculating the force of attraction between two objects.
What is
200
The eccentricity of the moon's orbit if for the moon, the perihelion distance has been found to be about 3.5 x 108 meters and the aphelion distance is about 4.2 x 108 meters.
What is e = 0.091?
300
Unlike circles, ellipses do not have a center, but rather two of these.
What are foci?
300
Kepler's constant is reported in these units.
What are s2/m3?
300
The greatest distance between an object in orbit and the object it is orbiting, represented by RA.
What is the aphelion distance?
300
These two values are necessary to calculate eccentricity.
What are c and a?
What are RA and RP?
300
The force of attraction between a 70 kg student and their 1 kg if they are 1 meter apart.
What is 4.67 x 10-9 N?
400
Kepler's constant for objects orbiting our sun.
What is 1?
400
g = a when a is reported in these units.
What are m/s2?
400
The value represented by the horizontal line.
What is the major axis?
400
According to the formula for universal gravitation, increasing the distance between two objects has this effect on the force of attraction.
What is an inverse effect?
What is force decreases?
400
The velocity of a satellite orbiting Jupiter if RJupiter = 70.5 x 106 m and MJupiter = 1.5 x 1027 kg.
What is 3.754 x 109 m/s?
500
According to Kepler's 3rd Law, the square of the period of revolution of a planet around the sun is proportional to the cube of this value.
What is mean distance from the sun?
500
g = a when r is reported in these units in the following formula. g = G (M/r2)
What are meters?
500
When an object turns around an internal axis.
What is rotation?
500
If you are working with an object at a height above the surface of a planet, you must add this height to this value to calculate r.
What is rplanet?
500
The strength of the earth's gravitation field 20,000 km above the earth's surface if REarth = 6.4 x 106 m and MEarth = 6 x 1024 kg.
What is 0.574 N/kg?