The force that makes an object go downward is gravity.

Here's a breakdown:

* Gravity: A fundamental force of nature that attracts any two objects with mass. The more massive the objects, the stronger the gravitational pull.

* Earth's Gravity: The Earth has a large mass, so it exerts a strong gravitational pull on objects near its surface. This pull is what we experience as weight.

* Downward Motion: When an object is released near the Earth's surface, gravity pulls it towards the center of the Earth, causing it to move downward.

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