Three blocks are in contact with one another on a frictionless, horizontal surfa

Question

Three blocks are in contact with one another on a frictionless, horizontal surface as shown here: http://i45.tinypic.com/536c21.gif . A horizontal force is applied to m1. Take m1 = 2.00 kg, m2 = 3.00 kg, m3 = 6.00 kg, and F = 19.0 N. (b) Find the acceleration of the blocks: magnitude ____ m/s2 (Please provide numerical answer) direction ____ left or right) (c) Find the resultant force on each block. block 1 ____ N block 2 ____ N block 3 ____N (d) Find the magnitudes of the contact forces between the blocks. between block 1 and 2: ____ N between block 2 and 3: ____N (e) You are working on a construction project. A coworker is nailing up plasterboard on one side of a light partition, and you are on the opposite side, providing "backing" by leaning against the wall with your back pushing on it. Every hammer blow makes your back sting. The supervisor helps you put a heavy block of wood between the wall and your back. Using the situation analyzed in parts (a) through (d) as a model, explain how this change works to make your job more comfortable.

Explanation / Answer

1. a = F/(Ma +Mb + Mc) 2. Fa = F - a(Mb + Mc) Fb = F - a(Ma + Mc) Fc = F - a(Mb + Mc) 3. F(a-b) = F - aMa F(b-c) = F - a(Ma + Mb) 4. If you can't fire up a calculator and figure this one out, it won't make any difference. You'll be taking the class over again ?

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