PHYS 218 Midterm: Texas A&M Physics 218 Exam2_Spring_2011_solutions
Document Summary
Spring 2011, sections 513- 515, 526, 528. Do not fill out the information below until instructed to do so! All work must be shown to get credit for the answer marked. Put your initials here after reading the above instructions:__________ Part 1: (25p) forces and dynamics. Table to be filled by the graders. From the free body diagram"s above we obtain: = 0 " n w = n 2 cos(!) Y : fk ! m1g + n 2 sin(!) = m1ay " k n 2 cos(!) m1g + n 2 sin(!) Where we"ve used ax = !ay tan(!) in the 2nd equation (right). We are left with a system of 4 equations and 4 unknown variables (n 2, n3, n w, ax ). Replacing n w and n 2 from the first and third equations into the second equation we get:
