The circular portion of part 1 contacts the curved portion o

The circular portion of part 1 contacts the curved portion of part 2. Neglect friction between part 1 and part 2. Consider the bodies to be in the orientations shown. Could the reaction of part 2 on part 1 be as shown? (a) I is possible, II is possible (b) I is possible, II is impossible (c) I is impossible, II is possible (d) I is impossible, II is impossible (e) Cannot say without more information

Solution

both are impossible as reaction force always act along to normal to the contect surface .

we need to draw tangent line to the surface at point of contact and then normal line , our force will act along the normal line .