After the fire was allowed to go out and the boys missed an opportunity for being rescued Jack managed to accept criticism from Ralph. However when Piggy also spoke against him Jack had an easy target on whom to vent his anger and frustration. Jack punched Piggy in the stomach, which made the fat boy sit down with a bump. Then Jack slapped Piggy's head, which send Piggy's glasses flying and resulted in one of the lenses breaking.
Jack attacked Piggy because he was power-hungry and saw Piggy as a threat to his authority over the boys. Jack was determined to maintain control and saw Piggy's intelligence and reason as a direct challenge to his savage rule. This led to an escalation of tension and ultimately resulted in Jack lashing out violently against Piggy.
Jack hates Piggy, he's really mean to him
Because, to Jack, Piggy is just some fat kid that wears specs and has "ass-mar". Plus, he wants to appear all tough in front of the rest of the crowd.
Roger and Maurice are the ones that attack Jack and Piggy because Jack wants Piggy's glasses.
Piggy
Jack
Piggy's glasses.
Jack orders the boys to kill Piggy and Ralf.
Piggy is the boy who does not dance at Jack's first feast in "Lord of the Flies." He is not physically capable of dancing due to his asthmatic condition, and he also struggles to keep up with the other boys due to his lack of physical fitness.
To show his power
piggy
Simon retrieved Piggy's spectacles after Jack had knocked them off, when he had smacked Piggy across the head.
In the story "Lord of the Flies", Jack scolds Piggy for speaking out of turn. Jack slaps Piggy across the face, breaking one of the lenses of his glasses.
ralph to piggy
to kill the pig