## inertial forces

1. The problem statement, all variables and given/known data
If I act a force on a system consisting of a heavy and light body in
contact with each other from the side of the heavy body and then I act
the same force from the side of the light body, the inertial force
between the two bodies would be the same?

2. Relevant equations

3. The attempt at a solution

I know from experience that the inertial force is bigger in the first case
Does friction has to do with the proof?
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 Recognitions: Homework Help Science Advisor The contact force between the objects has to accelerate the body that you are not pushing on directly. So if you push on the lighter one, the contact force is greater than if you push on the heavier one. Nothing to do with friction.
 Thank you for your immediate answer. Let me see if I got it right. If the masses m (the light one) and M (the heavy one) are a system of bodies, then no matter on which side I act the force F, the acceleration will be the same, i.e. a. If I act the force F on the mass m, the contact force F΄ must accelerate the mass M to a. If I act the force F on the mass M, the contact force F΄΄ must accelerate the mass m to a. Since a is the same and M>m, then F΄>F΄΄ If there is friction, the only difference is that I will have another acceleration, i.e. a΄

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