# Whengravitawonalforceistheonlyforce

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Unformatted text preview: he weight of an object is the gravitaWonal force on it.   Weight is given by , ! ! Fg = mg where g = 9.81 m/s2 is the constant of gravitaWonal acceleraWon, which is about the same for all objects near the Earth’s surface and points toward the center of Earth.   When gravitaWonal force is the only force acWng on an object, it is in free‐fall.   “Apparent weight,” or our sensaWon of the gravitaWonal force comes from forces that balance it.   The force that the chair exerts on you upward when you sit on it, for example.     If you are in free‐fall, your apparent weight is zero, and this condiWon is called “weightlessness.” Weightlessness happens when an astronaut is in a satellite orbiWng around Earth, or going down on a verWcal roller coaster (neglecWng the air resistance and fricWon).         The weight of an object depends on where it is. Its weight on the moon is about 1/6th of that on Earth because of the weaker gravitaWonal force on the moon. Mass is an intrinsic property of an object, a measure of its inerWa, and it does not mager where it i...
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