While riding a skateboard, Nina ran into a rough patch of pavement, but she thought she could ride right over it. Instead, the skateboard stopped but Nina didn't. Nina kept moving forward due to

Nina kept moving forward due to the principle of inertia, which is a concept from Newton's First Law of Motion. This law states that an object in motion will remain in motion at a constant velocity unless acted upon by a net external force. In this scenario: 1. **Initial Motion**: Nina was riding the skateboard, which was in motion. 2. **Rough Patch**: When the skateboard hit the rough patch of pavement, it experienced a significant increase in friction, which acted as an external force that stopped the skateboard. 3. **Inertia**: However, Nina's body, which was in motion, continued to move forward because there was no immediate force acting on her to stop her motion. This is due to inertia, which is the tendency of an object to resist changes in its state of motion. Thus, while the skateboard stopped, Nina's inertia caused her to continue moving forward until she eventually fell or was stopped by another force (like the ground).