Three boxes are pulled to the left by strings with negligible mass on a horizontal surface, as shown above. The masses of the boxes are mi, m2, and m3, where m3 > m2 > m1. Friction between the boxes and the surface is negligible. The figure below shows force diagrams for each box. the boxes and the surface izontal surface, as si Fn3 Fn2 TA TAA TB TB m19 m29 m39
Students attach a force probe in the middle of string A to measure TA and then use a different force probe to provide the applied force F to the box of mass mi. With the box of mass m3 held in place by one student, a second student pulls to the left on the force probe that provides the applied force F. As the second student pulls with a steady force, and with the boxes remaining at rest, the following pairs of readings from the two force probes are recorded at different times. Time F(N) TA (N) ti 10.6 11 10 10.4 10.2 10.8 10 11 t5 10.6 11 Based on the measurements above, how do the magnitudes of the two force quantities compare?
The two quantities exactly agree numerically. The two quantities agree within experimental uncertainty but do not exactly agree numerically. The two quantities disagree by an amount that is larger than the experimental uncertainty. The two quantities cannot be compared because the two force probes have different levels of precision. Note:box is shown with its force component in the figure