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Look at the link above for reference (sorry, im not very skilled at paint)

It's on a horizontal platform moving with a constant acceleration.

Question 1: Calculate the contact forces between objects 1 and 2.

My Answer: It's a simple F=mg, surface area doesn't matter with forces, only pressure does. But do i use both masses or just mass1? (the force of mass1 ON mass2)

Question 2: Calculate the weight that would show on the scale.

My Answer: W = (m1 + m2)g

Question 3: Calculate the frictional forces assuming that the platform, scale and objects 1 and 2 are made out of the same material of coefficient of static friction "mew sub s".

My Answer: I'm still working this one out so any help would be greatly appreciated. I'm just writing/drawing out the forces on each object; haven't come to anything definate yet.