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Physical bullying is any intentional act causing injury or trauma to another person or animal by way of bodily contact. In most cases, children are the victims of physical abuse, but adults can also be victims, as in cases of domestic violence or workplace aggression. Alternative terms sometimes used include physical assault or physical violence, and may also include sexual abuse. Physical abuse may involve more than one abuser, and more than one victim.

Forms
Physical abuse means any non-accidental act or behavior causing injury, trauma, or other physical suffering or bodily harm. Abusive acts toward children can often result from parents' attempts at child discipline through excessive corporal punishment.
Causes
A number of causes of physical abuse against children have been identified, the most common of which,   
according to Mash and Wolfe, being:
many abusive and neglectful parents have had little exposure to positive parental models and supports.
there is often a greater degree of stress in the family environment.

information-processing disturbances may cause maltreating parents to misperceive or mislabel their child's behavior, which leads to inappropriate responses. there is often a lack of awareness or understanding of developmentally appropriate expectations
Physically abused children are at risk for later interpersonal problems involving aggressive behavior, and adolescents are at a much greater risk for substance abuse. In addition, symptoms of depression, emotional distress, and suicidal ideation are also common features of people who have been physically abused. Studies have also shown that children with a history of physical abuse may meet DSM-IV-TR criteria for posttraumatic stress disorder (PTSD). As many as one-third of children who experience physical abuse are also at risk to become abusive as adults Researchers have pointed to other potential psycho-biological effects of child physical abuse on parenting when abused children become adults. These recent findings may, at least in part, be carried forward by epigenetic changes that impact the regulation of stress physiology. Many other potentially important consequences of childhood physical abuse on adolescent and adult physical and mental health and development have been documented via the Adverse Childhood Experiences (ACE) studies.