Vector question on component subscripts

[pillar]

What does A₁mean? This A₁ component does not even have a X subscript.
Then there's A_1x and resultant R₂.Can anyone give an example on how to interpret and graph both vector components & resultant from a problem?

Thanks in advance.

 

[cristo]

Do you have a specific question, or context, in which you've seen this?

 

[pillar]

Do you have a specific question, or context, in which you've seen this?

It's lab, but I haven't seen this in the book.

1 Mount a pulley at the 20 degree mark on the force table and suspend a mass of 100 grams over it. This gives a force A₁. Next, mount a second pulley at the 120 mark and suspend amass of 200 grows over it, giving a force A₂.

a. Calculate the magnitudes of these forces, their representive langhts, and their components. Record these calculations in table 1.

b.Draw a vector diagram for A₁ & A₂ with their lengths represented in centimeters. Use the parallelogram method to add these vectors geometrically to get the resultant vector R₁=A₂ + A₂.

 

[cristo]

Oh, ok, well the subscript doesn't mean anything too special there. You could just call the forces A and B, with resultant R. The subscript in that case is just a label.