Final answer:
Intentional injuries occur with the intent to harm, while unintentional injuries occur without intent.
Step-by-step explanation:
The primary difference between intentional injuries and unintentional injuries is that intentional injuries occur with the intent to harm, while unintentional injuries occur without intent. For example, if someone purposely hits another person, causing harm, it would be considered an intentional injury. On the other hand, if someone accidentally slips and falls, resulting in injury, it would be classified as an unintentional injury.