In this diagram, V represents the force due to friction. The equation for the force due to friction is , where is the coefficient of friction.

In this case, Z represents the normal force. We can re-write the equation for friction:

Z can be re-written in terms of the angle, but will always need to be multiplied by the coefficient of friction in order to give an equation for V.

The other equations are true.

- X and Y form a right angle, so the Pythagorean theorem applies.

- Z is the normal force, which is, by definition, equal and opposite the vertical force of gravity.

- W is the total force of gravity, which will be equal to the mass times the acceleration of gravity.

- the triangle formed by W, X, and Y is similar to the triangle formed by the surface, Q, and P, meaning that these angles must be equal.

In this problem, Y and Z are equal, but opposite forces, and Z is our normal force.

If we can solve for Y, then we can find Z.

We can use our understanding of trigonometry to find an equation for Y.

If we plug in  for the angle, we see:

Since we are solving for Y, we can multiply both sides by W.

Now that we know an equation for Y, we can return to our original equation to solve for Z.

There is no way for us to know the distance the object travels. Even though the force diagram places our object roughly halfway up the plane, we do not know the position where the object starts or where the object ends. We cannot calculate a change in distance.

We can use our understanding of trigonometry to find this relationship, since X and Y form a right angle.

If we plug in  for the angle, we see that X is opposite of and W is the hypotenuse.

Since we're looking for X, we can multiply both sides by W.

For this problem, we need to break the forces into horizontal and vertical components. The only difference with an inclined plane is that you have to translate the horizontal plane to be parallel to the surface upon which the object is traveling, and the vertical plane to be perpendicular to the surface upon which the object is traveling.

Luckily, this is already done in the diagram, with the force of gravity (W) broken into the vertical component (Y) and horizontal component (X).

Now, we need to sum the forces in each plane. The forces in the vertical plane will be perpendicular to the surface: Z and Y.

Since Z and Y are opposite and equal forces:

There is no net force in the vertical plane. This makes sense, as we would not expect the object to have any movement perpendicular to the surface on which it is sliding.

Now we can sum the horizontal forces: V and X.

Note that X is positive and V is negative. This is because V represents the force of friction, and is opposite to the force of X.

Since there is no force in the vertical plane, this gives our final net force: .