Answer:
Gravity
With less gravity, it is harder to keep your body strong. If the Earth's gravity is lost, all items held to the Earth's surface by gravity would float away. That includes the atmosphere, water, people, cars and animals. If an object were secured strongly to the Earth, it would probably remain attached
Friction
Friction stops things from sliding apart. If there was no friction everything would slide to the lowest point. It would be impossible to climb up anything. Imagine trying to climb a wall of ice without crampons and an ice pick. It would be impossible.
From the human perspective, it would be impossible to stand up or even move. Simply crawling requires a force to make you move. That is provided by friction.
With no friction the only possible movement would be falling to a lower point under gravity.
