Question

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1. what evidence do we have that the direction of earths gravitational force is downward, toward the center of earth?

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1. is the force of gravity the same in all locations on earth?

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Explanation:

1. Common observational and experimental evidence confirms this direction: when objects are dropped, they fall toward the ground (which points to Earth's core); the spherical shape of the Earth means that "down" for any observer locally points to the planet's center; and satellite orbits, which rely on gravity pulling toward Earth's core, demonstrate this directional pull.
2. The force of gravity varies slightly across Earth's surface because Earth is not a perfect sphere (it is an oblate spheroid, wider at the equator), so distances to the core differ; additionally, local variations in crust density and elevation change the gravitational pull.

Answer:

1. Evidence includes: dropped objects fall toward the ground (Earth's core), the spherical Earth means "down" points to its center, and satellites orbit due to gravity pulling toward Earth's core.
2. No, the force of gravity is not the same in all locations on Earth.