Can my child be forced to testify in court about child abuse?

My son’s mother was physically abusive to him to the point of leaving bruises which were seen the next day by his teacher at school. She reported it and my son’s mother has been criminally charged with physical child abuse. She pled not guilty and a trial has been set. We have not heard from the state prosecutor yet regarding what my son’s role in this trial will be. He is terrified of his mother and does not want to face her in court. He’s 10 years old, can a judge require him to appear in court and testify against his mother about the abuse? I am afraid of the mental damage this would do to him if he has to do this.