# Kepler’s Laws of Planetary Motion - PowerPoint PPT Presentation

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Kepler’s Laws of Planetary Motion. STARTER. A month is around thirty days because: a. that gives a year 12 months. b. the moon orbits the Earth in about 30 days. c. the number 365 is divisible by 30. d. the lunar eclipse occurs 30 times each year. . Practice/Application.

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Kepler’s Laws of Planetary Motion

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### Kepler’s Laws of Planetary Motion

STARTER

A month is around thirty days because:

a. that gives a year 12 months.

b. the moon orbits the Earth in about 30 days.

c. the number 365 is divisible by 30.

d. the lunar eclipse occurs 30 times each year.

### Practice/Application

Research and write down Kepler’s Three Laws of Planetary Motion in your science notebook. You may use the web ( hyperphysics is a good source) or any text.

Construct an accurate ellipse using string, cardboard, and push pens. Label the foci, the semi major axis, and the semi minor axis. Draw in the position of the Sun and an orbiting planet. Put this in your science notebook. http://www.mathsisfun.com/geometry/ellipse.html

Make a data table for the planets. The data should contain:

1. The mass of each planet in kg.

2. The distance in meters from the planet to the Sun.

3. The period of each planet.

Put this in your science notebook.

### Notebook Checklist

Definitions of Kepler’s 3 Laws of Planetary Motion.

Drawing of Ellipse Construction properly labeled.

Planetary Data Table with

1. The mass of each planet in kg.

2. The distance in meters from the planet to the Sun.

3. The period of each planet.

### Connection

Referring to your list of the planets and their

periods, which of Kepler’s laws does this confirm?

Explain in detail.

### Exit

3 minute writing: Comment on why you think Kepler’s Laws

may have guided Newton in his search for the gravitational law.