To make a more permanent shelter, and organize food gathering.
to kill the pig
piggy's glasses
Roger and Maurice are the ones that attack Jack and Piggy because Jack wants Piggy's glasses.
Jack and his tribe.
ralph to piggy
Piggy concludes that Jack does not like him or Ralph, and sees them as obstacles to his authority and leadership on the island. He believes Jack views him and Ralph as weak and inferior to himself.
Ralph wants to get Piggy's specs back and Piggy wanted to kill Jack there and then.
Jack is initially defensive when Piggy and Ralph enter his camp in Chapter 9 of "Lord of the Flies." He asserts his authority and demands to know why they have come. Jack's reaction is indicative of the growing hostility and power struggle between him and Ralph.
Piggy is fully aware that Ralph is the only thing that is preventing Jack from becoming chief. Piggy knows that if Jack does become chief all hope of rescue will disappear because Jack will only bother about hunting and the signal fire wil be forgotten. Piggy is also fearful for his own safety.
Ralph respects Jack more than Piggy because Jack embodies strength, charisma, and hunting skills that Ralph admires. Piggy, on the other hand, is often seen as weak, unathletic, and reliant on others for survival. Additionally, Ralph and Jack share a similar leadership style and natural authority, making it easier for Ralph to respect Jack.
Jack orders the boys to kill Piggy and Ralf.
Jack attacked Piggy rather than Ralph because he knew Piggy wouldn't fight back. If he had attacked Ralph there was a good chance that Ralph would have beaten him and Jack couldn't take the risk of losing face in front of his own hunters.