Question

8. A heavy trunk is lying on the floor. A boyapplies a force of 100 N to pull it, but fails.Then a man pulls it by a force of 300 N, butfails. Then an athlete applies a force of 600 Nand is able to pull it. What force does itpreventfrom moving in the first two cases? Whatconclusions can you draw about the force from11

Answer 1

Answer:

static frictional force was preventing movement in the first 2 cases and sorry I didn't understand the 2nd question

Answer 2

A question from mechanics "friction"

According to question

A boy A man and a athelete tries to pull the truck but only athelete was able to pull it because of high force of pull applied.

This is because the friction between truck and earth was nearly 600N Newton which only athelete was able to apply. As he applied a force of 600N he overcame the limiting force of friction and pull it off but the boy and man didn't applied enough force to overcome limiting friction so they were not able to move the truck.