This then gives the force applied under that particular axis and angle. The free body diagram of the above shows five different forces acting on the ship. Tension, friction and the force of the push all act on the x axis of the reference frame. The normal force and gravity are then considered to be of the y axis of the reference frame. The push of the motor is in the positive x axis.
Friction is opposite of that motion, which is in the direction of the push.
Here we see a new force, tension, which is the same motion as the push. The tension is applied by a rope or string attached to the bow of the boat. Seeing a force is applied when the boat is pulled forward from the tension that acts on the boat by the rope is in the positive x direction. In this case friction is no longer static, but kinetic, once motion is observed.