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Gravity, Inertia, and Planetary Motion
Transcript of Gravity, Inertia, and Planetary Motion
moving object to continue in a
straight line until another force
act upon it. Orbit What does the dotted line
represent? What happens if we let go
of the string? What two forces keep planets in
their orbital paths? Inertia Gravity Orbit What could the hand and ball represent? What force does the string represent? Gravity Why does the ball continue to move around my hand? Inertia Where would you place the moon and its orbit in this diagram? What two factors determine the strength of gravitational pull between objects? How do we know planets orbit? In 1610 Galileo used a telescope to observe stars around Jupiter. He originally thought he saw three stars near Jupiter, strung out in a line through the planet. The next evening, these stars seemed to have moved the wrong way, which caught his attention. Galileo continued to observe the stars and Jupiter for the next week. Six days later, a fourth star appeared. After a few weeks, Galileo had observed that the four stars never left the area of Jupiter and appeared to be carried along with the planet, and they moved with each other around Jupiter. Finally, Galileo determined that what he was observing were not stars, but planetary bodies that were in orbit around Jupiter. This discovery provided evidence to support that everything did not revolve around the Earth but around the Sun. What were these planetary bodies?? GALILEAN MOONS Io: Covered with large active volcanoes
Callisto: Icy and covered with craters
Ganymede: Largest moon in the solar system
Europa: Has liquid water underneath GALILEAN MOONS "I Eat Green Caterpillars" Rotation vs. Revolution RotAtion: plAnet spins around an Axis RevOlution: Object moves around anOther Object Gravity, Inertia,
and Planetary Motion