Kepler'S Laws Astronomy Worksheet With Answers
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5Kepler's laws
1. The increase in a planet's speed as it approaches the
5. The diagram below represents the path of a planet
Sun is described by Kepler's second law. What is the
moving in an elliptical orbit around a star. The orbital
best explanation for this empirical law?
period of the planet is 1,000 days.
A) Since kinetic energy depends on temperature, the
planet must move faster as it nears the Sun.
B) Ions from the Sun (solar wind) speed up the
planet.
C) The days are shorter in the winter, causing the
planet to move faster as it nears the Sun.
D)
The gravitational potential energy lost as the
planet nears the Sun becomes kinetic energy.
2. The symbols below are terms for Earth orbiting the
Sun and a comet orbiting the Sun.
According to Kepler's laws, how many days are
required for the planet to travel from the starting point
= the mean radius of Earth's orbit
to point X?
= the period of Earth's orbit
A) 400
B) 350
C)
300
D) 250
= the mean radius of the comet's orbit
= the period of the comet's orbit
Compared to the value of
, the value of
is
A) smaller
B) larger
C)
the same
3. What would occur as a result of the frictional drag of
the atmosphere on an artificial satellite orbiting the
Earth?
A) The satellite would increase in speed and escape
the gravitational field of the Earth.
B) The satellite would increase in speed and spiral
toward the Earth.
C) The satellite would decrease in speed and escape
the gravitational field of the Earth.
D)
The satellite would decrease in speed and spiral
toward the Earth.
4. Which statement is consistent with Kepler’s laws of
planetary motion?
A) The planets move at a constant speed around the
Sun.
B) The speed of a planet is directly proportional to
the radius of the path of motion.
C) The more massive the planet, the slower the
planet moves around the Sun.
D)
An imaginary line from a planet to the Sun sweeps
out equal areas in equal time intervals.
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