Question

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 1

Correct Answer - A `rarr` t,B` rarr`s
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.