What is the reason that friction is present in surface to surface contact?

there is water in the lubricant

surfaces have microscopic peaks and valleys

one surface is larger than the other surface

surfaces are very smooth and highly polished

Someone with this coz i don’t really know what i can choose, just pick whatever u want. homework - you need to choose a website that you like or use frequently. you must visit the website and discuss 6 different features/parts/aspects of the website that you think makes it good. (100 words)

Which of the following does 3d animation create an illusion of on the screen? a. depth b. emotion c. length d. dialogue

Iam a bacterium. i cause stomach cramps and diarrhea. i am caused by eating rotten foodssuch as chicken, fish, or eggs. sometimes turtles carry my bacteria. what am i?