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The question is asking about the direction of the force of friction when a block is sliding down an inclined plane.

The correct answer is **B. parallel**. 

Here's why:
- The frictional force acts **parallel** to the surface of the inclined plane, opposing the motion of the block as it slides down.
- If the block is sliding down the plane, the friction opposes this movement and is directed up the incline, along the surface.

Would you like more details on this, or have any questions about inclined planes and forces?

Here are five related questions for further practice:
1. What is the role of the normal force on an inclined plane?
2. How does the angle of inclination affect the magnitude of friction?
3. What is the relationship between the gravitational force and friction on an incline?
4. How can the coefficient of friction be determined from a sliding block experiment?
5. What happens to the frictional force if the surface of the incline becomes smoother?

**Tip**: The frictional force depends on both the normal force and the coefficient of friction between the two surfaces.

When a block is sliding down an inclined plane, the force of friction is also referred to as the __________ force.

Learn about the force of friction on an inclined plane. The frictional force acts parallel to the surface, opposing the motion of the block. Suitable for students in Grades 9-11.

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