Hi,
Welcome to our community! 
At the moment, we do not use any custom Physic material. This means that the Colliders and Rigidbodys use Unity’s default material with 0 friction. 0 friction means “like on ice”.
Create a new Physic Material in your assets folder. Assign that material to the ground. Increase the friction value significantly and test your game. If the behaviour improves, tweak the value until you are happy with the result.
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