PHYS 031 Lecture : Phys 031 Chapter 7A.docx

• School: University of Vermont
• Department: Physics
• Course: PHYS 031
• Professor: Jie Yang

Document Summary

T fs = 0 y direction: N fgb = 0 n = fgb. Joint is stationary. x direction: t2 cos45 - t = 0 y direction: t2 sin45 - ta = 0 sin 45 = cos 45 . * mb * g = ma * g. 1: x direction: t fk +fg1 sin20 = 1 a1x y direction: n fg1 cos20 = 0. 2: x direction: fg2 sin20 - fk2 t = 2 a2x y direction: n2 fg2 cos20 = 0. T fk1 + fg1 sin20 = 1 a1x. + (fg2 sin20 - fk2 t = 2 a2x) Fk1 + sin20 (fg1 + fg2) fk2 = 1 a1x + 2 a2x. 1: fka t = 1 a1x y direction: 2: 20 t fka fkb = 2 a2x y direction: 20 t fka fkb = 2 a2x. 20 2fka fkb = 2 a2x 1 a1x. **abs = absolute value a1x = - a2x.