The combined effect of these two variations is that if you weigh around 60 kg standing on a scale at the equator and compare that with standing on a scale at the North Pole you might be about half a pound or 1/4 kg heavier at the North Pole.
So, a quick answer in summary is that gravitational force greatly exceeds centripetal force and acts towards the earth's centre for people all around the earth.
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Sunshine say: The Earth's gravity pulls us towards its core. Since the core is a sphere gravity will always pull us "down"
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Josh say: Well technically in perspective of being in space there is no "upside down", but to answer your question the centre of earth has a gravitational pull that keeps us on the ground.
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bubby say: Velcro.
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quantumclaustrophobe say: The gravitational pull towards the center of the Earth is far more powerful than the outward centripetal force trying to eject us off the planet.
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Raymond say: Gravity pulls towards the centre of mass, which is the centre of the sphere.
Therefore, wherever you are on the surface, you are pulled towards the ground (therefore towards the centre of mass).
To fall into space, you'd need to have a force acting towards space... and there is not one.
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Ronald 7 say: The Earth's Gravity keeps us attracted to the ground.
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Brigalow Bloke say: Gravity works in all directions and pulls everything toward the centre of the Earth. There is no up or down in space.
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Connnor say: The earth has a gravitational pull to the core of the earth. So when we are "upside down" we are held on the surface by a gravitational pull
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spot a say: A) It is a sphere
B) gravity acts toward the centre of the sphere and holds people, animals, water, air and everything else onto the surface
Gravity is why satellites stay in orbit and why your GPS works with signals from orbiting satellites
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