iPad 2:36 PM FlipltphysicPhysics 4A Mechanics and Wave Motion Fall 2017 maomilan
ID: 3280392 • Letter: I
Question
iPad 2:36 PM FlipltphysicPhysics 4A Mechanics and Wave Motion Fall 2017 maomilan learning Homework: Friction Accelerating Blocks Accelerating Truck Abox rests on top of flat bed truck. The box has a mass of m· 17kg. The coefficient of stack friction between the Mass On Incline 2 t, The truck accelerates trom rest to -15 m/s t " 14 s Dhich s slow enough that the box will not slide). what s the acceleration of the box 2, in the previous situation, whats thfrictional force the truck exerts on th" box, 3) What is the maxinum acceleration the truck can have before the box begins to side? Now the acceleration of the truck remains at that value, and the bo begins to slide. What is the acceleration of the 5) With the box stll on the truck, the truck attains its maximum velocity As the truck comes to a stop at the ext stop light, what is the magnitude of the maximum deceleration the truck can have wthout the box siding? 6l Below is some space to write notes on this problemExplanation / Answer
A) Maximum frictional force = us mg = 0.82*17*9.8 = 136.6N
acceleration of truck = delta v/delta t = 15/14
= 1.0714 m/s^2
Frictional force to avoid relative motion = ma = 17*1.0714
= 18.2 N which can be provided by friction.
So acceleration a = 1.0714 m/s^2
B) F =18.2 N found above
C) maximum acceleration a= maximum Force /m
= 136.6/17 = 8.04 m/s^2 Answer
D) Acceleration = Kinetic Friction /m
= 0.67*9.8 = 6.57 m/s^2
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