# Kepler’s second law implies what about planetary motion

## What is the implication of Kepler’s second law of planetary motion?

Kepler’s second law of planetary motion describes the speed of a planet traveling in an elliptical orbit around the sun. It states that a line between the sun and the planet sweeps equal areas in equal times. Thus, the speed of the planet increases as it nears the sun and decreases as it recedes from the sun.

## What does Kepler’s third law imply about planetary motion?

According to Kepler’s third law, the square of the planet’s period in years is: proportional to the cube of its semimajor axis in A.U. What does Kepler’s third law imply about planetary motion? Planets further from the Sun orbit at a slower speed than planets closer to the Sun.

## Why is Kepler’s second law important?

Kepler’s Second Law is valuable because it gives a quantitative statement about how fast the object will be moving at any point in its orbit. Note that when the planet is closest to the Sun, at perihelion, Kepler’s Second Law says that it will be moving the fastest.

## What is an example of Kepler’s second law?

Kepler’s Second Law is an example of the principle of conservation of angular momentum for planetary systems. … Consider two points \$P\$ and \$Q\$ on the orbit of a planet, separated by avery small distance. Suppose that it takes a small time \$dt\$ for the planet to move from \$P\$ to \$Q\$.

## What is Kepler’s third law formula?

If the size of the orbit (a) is expressed in astronomical units (1 AU equals the average distance between the Earth and Sun) and the period (P) is measured in years, then Kepler’s Third Law says P2 = a3. where P is in Earth years, a is in AU and M is the mass of the central object in units of the mass of the Sun.

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## What is the formula for Kepler’s 2nd law?

“Equal areas in equal times” means the rate at which area is swept out on the orbit (dA/dt) is constant. So Kepler’s Second Law Revised: The rate at which a planet sweeps out area on its orbit is equal to one-half its angular momentum divided by its mass (the specific angular momentum).

## What are Kepler’s 3 laws in simple terms?

There are actually three, Kepler’s laws that is, of planetary motion: 1) every planet’s orbit is an ellipse with the Sun at a focus; 2) a line joining the Sun and a planet sweeps out equal areas in equal times; and 3) the square of a planet’s orbital period is proportional to the cube of the semi-major axis of its …

inertia

## Why did Ptolemy believe the Earth was stationary?

He believed that the Earth was the center of the Universe. The word for earth in Greek is geo, so we call this idea a “geocentric” theory. … In order to make his predictions true, he worked out that the planets must move in epicycles, smaller circles, and the Earth itself moved along an equant.

## What does Newton’s second law state?

Newton’s second law of motion pertains to the behavior of objects for which all existing forces are not balanced. The second law states that the acceleration of an object is dependent upon two variables – the net force acting upon the object and the mass of the object.

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## Why is Kepler’s third law important?

The orbital period is given in units of earth-years where 1 earth year is the time required for the earth to orbit the sun – 3.156 x 107 seconds. ) Kepler’s third law provides an accurate description of the period and distance for a planet’s orbits about the sun.

## Is Kepler’s second law true?

Kepler’s second law he again discovered by trial and error. Kepler realized that the line connecting the planet and the Sun sweeps out equal area in equal time. … This means that when planets are near the Sun in their orbit, they move faster than when they are further away.

## What is the period law?

The Law of Periods: The square of the period of any planet is proportional to the cube of the semimajor axis of its orbit.

## Why do planets speed up when closer to the sun?

The closer a planet is to the Sun, the less time it takes for it to go around the Sun. It takes less time because the length of the orbit is shorter (a smaller orbit), but it also moves faster in its orbit. Thanks to gravity, it has to move faster in its orbit to stay in orbit!