1. The problem statement, all variables and given/known data A mass M is initially at rest on a horizontal surface, μs=0.30 and μk=0.20 . A horizontal string then pulls M with a tension T. N is the normal component of the contact force. All quantities below are magnitudes. True or False: 1) If M does not accelerate, then T ≤ μsN 2) M will accelerate if T exceeds μkN 3) M will accelerate if T exceed μsN 4) The value of N equals Mg 5) T equals μkN if M remains at rest. 6) The total force on M is μkN if M remains at rest. 2. The attempt at a solution From what i have learned i thought the answer should be: 1) True (to gain acceleration, first F must exceed μsN) 2) True (it takes µkN, force to just move M, and anything over that will accelerate M) 3) True 4) True (mg = N, the normal force) 5) False (T is less than or equal to µsN for M not to move) 6) False (The total force on M is equal to or less than µsN for no movement) The in incorrect but i am not sure as to why they are wrong.