Planetary Motion (some history)

What shape is Earth's orbit?

• circle

• ellipse

• square

• spiral

What is Kepler's 1st law?

• The planets orbit in an ellipse

• The plants move faster when they are closer to the sun and slower when they are further from the sun

• The farther a planet is from the sun the slower the orbit

  (P² = a³)

What is Kepler's 2nd law?

• The planets orbit in an ellipse

• The plants move faster when they are closer to the sun and slower when they are further from the sun

• The farther a planet is from the sun the slower the orbit

  (P² = a³)

What is Kepler's 3rd law?

• The planets orbit in an ellipse

• The plants move faster when they are closer to the sun and slower when they are further from the sun

• The farther a planet is from the sun the slower the orbit

  (P² = a³)

The point in the earth's orbit where it is closest to the sun and moves the fastest.

• aphelion/apogee

• perihelion/perigee

The point in the earth's orbit where it is farthest to the sun and moves the slowest.

• aphelion/apogee

• perihelion/perigee

What is gravity?

• a force between objects that pushes them apart

• a force between any two objects that pulls them together

• a force that causes objects to remain at rest

• a force that causes people to always fall in love...see what I did there?!!

What is true about the distance between a planet and the sun and the planet’s revolution around the Sun?

• The closer the planet is to the sun, the slower it orbits.

• The farther the planet is to the sun, the faster it orbits.

• The farther the planet is to the sun, the brighter the sun is.

• The closer the planet is to the sun, the faster it orbits.

The ___________ the planet is from the sun, the ____________ it takes to go around the sun.

• closer, shorter

• farther, shorter

• farther, longer

• closer, longer

How does the mass of an object effect the gravitational attraction of an object?

• The smaller the mass of the object the greater the gravitational force.

• The mass of the object has no effect on the gravitational force

• The greater the mass of the object the less the gravitational force.

• The greater the mass of the object the greater the gravitational force.