Masters or just plain slave owners
A master is the owner of a slave.
North Slave owners did pay their slaves, but south slave owners didn't. See the following link.
they were looking for strength and physical looks. They also were looking for how hard a slave worked.
Slaves were considered animals, so they were not treated human. Slaves who worked and lived on plantations were the most frequently punished. Punishment could be administered by the plantation owner...