Question

Three boxes, with masses m1, m2, m3 (kg) are stacked vertically; the bottom box is in contact with a rough floor and the surfaces between each box are also rough. An external force Fext (N) acts on the bottom box at an angle of XX degrees relative to the horizontal, as a result of which all three masses accelerate together with an acceleration a (m/s^2). a) Identify the number of forces acting on each box, b) starting with the top box, and using the fact that F2,1=-F1,2 determine the value of all the frictional forces, as well as normal forces acting in the problem. To do this, you'll have to work your way 'down', starting at the top, and then working your way to the box on the floor, from which you can determine the (unknown) frictional force of the floor with the bottom box. Note that not all combinations of "a" and your external force "F" are physical. E.g., you can't apply a 1 N force and then have the mass accelerate at 100 m/s2. Note also that, depending on the angle that your external force is acting on the bottom box, the normal force of the floor on the bottom box will be reduced

Please show your work and explain to me how you got there. You can basically make up any number for the bolded parts

Answer 1

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