A free-body diagram that matches the description of a box sliding up an inclined plane with friction, and speeding up can be seen in the image attached below.
Objects ( e.g. box) are known to speed down the inclined planes due to unbalanced force. To get this type of motion, it is crucial and necessary to study the forces acting upon an object on an inclined plane.
As shown in the diagram attached below, there are usually at least two forces acting upon any object that is subjected on an inclined plane.
The force of gravity is the force acting in the downward direction.
The normal force is the force acting in a direction perpendicular to the surface.
Therefore, from the image attached below, we can see how the box is sliding up an inclined plane.
Learn more about force here:
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