Match the following columns. {:("Column I","Column II"),("(A) Force of friction","(p) Oppose motion"),("(B) Normal reaction on a block kept on horizontal ground","(q) Oppose relative motion"),(,"(r) Is always mg"),(,"(s) May be equal to mg"),(,"(t) None"):}

Match the following columns. {:("Column I","Column II"),("(A) Force o

1.	Match the following columns. {:("Column I","Column II"),("(A) Force of friction","(p) Oppose motion"),("(B) Normal reaction on a block kept on horizontal ground","(q) Oppose relative motion"),(,"(r) Is always mg"),(,"(s) May be equal to mg"),(,"(t) None"):}
Answer» Solution :FORCE of friction opposes relative motion between two bodies in contact. It does not simply opposes the relative motion. Further, N=mg, only when no inclined force is ACTING on the BLOCK as shown in figure.