Consider the following statements:
1. Static friction can exist by itself even in the absence of external force.
2. The component of contact force normal to the surface is called friction.
3. Static friction supports the impending motion.
Which of the above statements are correct?
1
1) and 3) only
2
All 1), 2) and 3)
3
2) and 3) only
4
none of the above