Weathering and rock slides
Friction is the force you get when you (for example) Rub something with another, it's a force that may generate heat and even some resistance. Another example is rubbing your hands together, they get hot, therefore friction is working, without friction you wouldn't be able to stop moving.
The force on the ship is more than a car
Speed = distance / time
S= 40 000m / 5400s
S= 7.41m/s