The emphasis of the orange-and-apple sequence in your text is

Understand the Problem

The question is inquiring about the emphasis of a specific sequence referred to as the 'orange-and-apple sequence' within a text, asking the respondent to identify the key concept being highlighted.

More Information

The orange-and-apple sequence emphasizes the concept of friction as a force within a system, which is foundational in understanding dynamics.

Tips

Avoid mixing the concept of mass with force, as they are distinct properties in physics.

Sources

• The web page with info on - Example Source - chegg.com