Which of the following statements is incorrect ?

If the sliding friction between two surfaces is found to be 8 N, then the static friction between these two surfaces is most likely to be:

Which of the following is not an advantage of friction?

If the static friction between two surfaces X and Y is found to be 20 N, then the rolling friction between these two surfaces should most likely be :

If the static friction between two surfaces P and Q is measured to be 50 N, then the sliding friction between these two surfaces is most likely to be :