Why Is It so Much Easier to Fall When Walking Down a Slope?

https://outdoorsfaqs.com/why-is-it-so-much-easier-to-fall-when-walking-down-a-slope/
It is much easier to fall when walking down a slope than walking up because of several separate reasons that act together. They include some physical forces, our body shape, and ground effects. Here is a short list:

There is a component of gravity force that acts in the direction of the slope. This holds for both downslope and upslope motion.

But there is a difference of this gravity force for the two directions. Your body experiences more force when you go downhill.

Effective foot friction may be smaller when you go downhill.

Lever arm of your foot is longer when you go uphill, and this is why you are more stable than going downhill.

When you extend your front foot to put it on the lower ground, your center of gravity is effectively higher. So you are less stable.

If you have a scree on a downhill path, it may slide down under your foot, and you will finish on your back. This is not so when you go uphill, you will fall forward and you have arms to prevent injuries.

All these reasons are explained in detail.