Newton's Law's Problem (Contact Force)
Basically 3 boxes, somehting like this; http://webassign.net/walker/0519alt.gif
Masses are as followed: M1= 28 kg, M2= 18.7 kg, M3= 28.7 kg. The applied force on the box is 644 N Part A) What is the magnitude of the contact force between M1 and M2 Part B) What is the magnitude of the contact force between M2 and M3 To find the contace force between M1 and M2, i used this equation; 644/(28 + 18.7) for Part A, and 644/(18.7 + 28.7) for Part B. The anwers are; Part A, 13.79, and for Part B, 13.58. Is this the correct method? If not, what can be done to achieve the correct answer? 
Re: Newton's Law's Problem (Contact Force)
Start by finding the acceleration of the total system of three blocks. Then take each block apart in a free body diagram, identify all forces acting on each block, and apply Newton's laws.

Re: Newton's Law's Problem (Contact Force)
and to find acceleration, i would use the formula, F/mg which is 644/28, 644/18.8, 644/28.7?

Re: Newton's Law's Problem (Contact Force)
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Re: Newton's Law's Problem (Contact Force)
the the entire mass is 75.4

Re: Newton's Law's Problem (Contact Force)
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