Martin Luther King Jr. once said, “Injustice anywhere is a threat to justice everywhere.” In the novel Copper Sun by Sharon Draper, the main characters encounter many forms of injustice. One type of injustice they experience is physical injustice. Another type of injustice they endure is emotional injustice. Lastly, the characters face social injustice. One type of injustice they experience is physical injustice. In the copper sun, it states, “Mr. Derby grasps the handle, drew his arm back, and fiercely brought the braided lash of it across Amari's back. She screamed and twisted in pain at his feet.” This is showing injustice because Mr.derby is beating her until close to death. He is treating her like she is nothing and that if she doesn't