Question

Think of a skateboarder riding down a hill. Once the skateboarder reaches the bottom of the hill, if she does not manually add motion, the skateboarder will slow until she stops. Why does the skateboarder eventually stop?

Answer 1

Answer:

From first law of motion, law of inertia, we know that an object remains in the state of rest or mation upon by an unbalance external force. As the skateboad is riding down the hill and reaches the bottem it will slow down due to frictional force acting in the opposite direction. Frictional force is a contact force which acts between two surfaces against the dircetion of motion of one surface over the other. Here, the frictional force acts between the skateboard and the ground. This reduces the speed of the skateboard and it eventually comes to a stop.