Newton's Law (object in motion): an object in motion stays in motion with the same speed and in the same direction unless acted upon by an unbalanced force. The picture shows that the cooler coaster will stay in motion until a greater force stops it.
Normal force is the upward force that balances the weight of an object resting on a horizontal surface. The box is resting on a horizontal surface. The normal force is what gives the surface support to hold the box horizontally.