People need to follow rules because then there would be tons of kaous if rules weren't around the world would most likely look like the world is ending or something.
I think the answer to this is A. the results of a scientific study.
Answer:
Explanation:
1. B force.
2. C friction
3. D sandy floor.
4. B opposite.
5. B
hope dis helps.
but i'm not sure about 3 and 5