Kepler's Laws

About 50 years before Newton formulated the law of gravity, Johanne Kepler (1571-1630) had found some rules that could be used to calculate the orbits of the planets
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Questions #: 8
Time: 5 minutes
Pass Score: 80.0%
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Kepler's First Law

According to Kepler's first law, planets orbit the sun in the shape of an ________

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Explanation

Drawing ellipse

The easiest way to draw an ellipse is to put two tacks in a piece of paper and put a loose loop of a string around them, as shown in the figure below.

tacks_draw_ellipse.gif

If the tacks are placed farther apart, how will the shape of the ellipse be changed?

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Drawing a circle

The easiest way to draw an ellipse is to put two tacks in a piece of paper and put a loose loop of a string around them, as shown in the figure below.

tacks_draw_ellipse.gif

What would the positions of the tacks have to be to draw a circle?

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State Kepler's first law

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Kepler's second law

As a planet orbits the sun, a line from the planet to the sun sweeps across equal areas in equal times.

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Does the planet move faster between A and B or between C and D?

kepler_second_law.gif

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What is the shape of the earth's orbit around the sun?

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Does the earth move at a constant speed around the sun?

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