The revisions look very good. Let me know if you have questions.
Here's the comments you made about my experiment. I made some changes to the forces in each table so I'm resubmitting both of them. I put below the comments you made and then my new work.
I believe the x and y components you should have calculated here are for the forces.
Also note that your angles have to be measured counterclockwise from the positive x axis.
Recalculute the magnitudes and send me a revision of just this table, along with the sums. The sums rounded to one decimal place will be -.3 N and -.6 N, very consistent with your polygon results of -0.4 and -0.6 N.
MY REVISIONS:
Rubber band # Force vector (N) Length of x component (1cm = 1N) Length of y component (1cm = 1N)
1 1.7 0 -1.7
2 1.4 -1.1 1.0
3 1.3 0.8 0.7
Total of the x components of the forces = 0 – 1.1 + 0.8 = -0.3
Total of the y components of the forces = -1.7 + 1.0 + 0.7 = 0
The coordinates of the resultant vector are (-0.3, 0).
Rubber band # Length (cm) of rubber bands Force (N) of each rubber band Angle (degrees) x components y components
1 11.5 2.0 270 0 -2.0
2 10.1 1.6 142.5 -1.3 1.1
3 10.8 1.5 50.2 0.9 1
Total of the x components of the forces = 0 + -1.3 + 0.9 = -0.4
Total of the y components of the forces = -2.0 + 1.1 + 1 = 0.1
The results from the polygon are (-0.3, 0) and here the results are (-0.4, 0.1), seemingly consistent.
The coordinates for the resultant are (-0.4, 0.1).