Ancient Astronomy and Planetary Motion

The law that describes the path of a planet that orbits the sun is called the

The more elliptical this ellipse gets… what happens to eccentricity?

Who believed that planets moved in epicycles as they revolved in larger circles around Earth?

The turning or spinning of a body on its axis is known as

A girl pulling a sled is crying because when she stopped the sled kept moving into her leg

An orange might roll off your cafeteria tray when you stop suddenly because of

the time required for a body to complete a single orbit

Which laws describes the speed of an object travels at different points in its orbits?

A swimmer pushes water back with her arms, but her body moves forward.

As an astronaut travels far away from Earth, her weight

Which scientist determined the nature of the forces that keep the planets in their orbits?

The tendency of an object to resist change in its motion is known as

The geocentric model of the universe stated that

Gravity on Mars is about 1/3 the gravity on Earth. The weight of you on the surface of Mars is

How do you calculate the eccentricity of this ellipse?

Which scientist was the first to use the telescope in astronomy?

The force that gravity exerts on an object changes the objects

Low eccentricity is what shape orbit?

Seasons are caused by

Summer Solstice

Law that each planet revolves so that an imaginary line sweeps over equal areas in equal time?

Earth is closest to the sun at a point called

Newton’s third law of motion describes

According to the 3rd law of planetary motion, the period of a planet is related to the planet’s

In a diagram depicting the solar system as heliocentric, what is located at the center?

The achievement of lifting a rocket off the ground and into space can be explained by

Which of the following helps explain why the planets remain in motion around the sun?

The force that pulls falling objects toward Earth is called

the degree of elongation of an elliptical orbit

Winter Solstice

Relationship between the aver distance of a planet from the sun and the planet’s orbital period

the force that exists between any two bodies in the universe

What movement of Earth is responsible for night and day?

So if a planet has an average distance of 4 astronomical units (AU) would have a period of

The first early astronomer to propose a sun-centered solar system was

In which of the following are action and reaction forces involved?

Using Tycho Brahe’s data, which scientist proposed three laws of planetary motion?

Which is the most likely reason that old observers believed in a geocentric universe?

Autumnal Equinox

a pattern that makes it appear as though planets are moving backward in the sky

The true shape of planetary orbits was discovered by

Which astronomer spent 20 years collecting data and making observations?

Vernal Equinox

Newton’s 2nd law, says the acceleration of an object=the force acting on the object/by object’s

One astronomical unit (AU) is

In the Ptolemaic model of the universe,

When a planet is at its perihelion what happens to it velocity?

the tendency of a body to resist a change in motion unless acted upon by an outside force

After you start up your dirt bike, as you give it more gas, it goes faster

What is the shape of a planet’s orbit?