Question

question 2: does friction seem to have any effect on the skateboarder’s movement, and how do you know? answer :

Explanation:

Friction does affect the skateboarder’s movement. We know this because without friction (e.g., on a perfectly smooth surface), the skateboarder would keep moving at a constant velocity due to inertia (Newton's first law). But in reality, the skateboarder slows down over time (or needs to push off the ground to keep moving), which is due to friction (between the wheels and the ground, air resistance, etc.) opposing the motion. Also, friction allows the skateboarder to stop (by applying brakes or dragging a foot) and to gain traction when pushing off the ground to accelerate.

Answer:

Yes, friction affects the skateboarder’s movement. We know this because the skateboarder slows down over time (without continuous pushing) due to friction opposing motion, and friction enables stopping (e.g., foot drag, brakes) and traction for acceleration (pushing off the ground).