Stop using fossil fuels.
The machine operator can stop machines.
Actually the good effect of friction is: if you drive a car you can make it stop, friction makes it stop. But the bad effect is: friction wears out machines so you can replace it. Hope it helps! :) Also with no friction the tires would just spin and go no place, and steering would be a problem.
Many Machines either run on, or are run by electricity. Remove the electrical parts or the electrical supply and the machine would stop.
The matter cycle would stop.
It would stop.
I assure you, I am not a computer. Real humans answer these questions. Promise.
The rotation of either body has no effect on a pair that are in mutual gravitational orbit. It would have effect at all.
stop cheating in your homework
stop using gas cars but that is only a small part of it
go to a therapist
Outputs would stop.