Newtonian Mechanics Easy Question

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Draw two separate diagrams: one for the bottom block and one for the top block.

For the bottom block, the forces acting should be: weight, normal reaction, friction between the block and the surface, friction between the blocks and the applied force.

I assume the question means what is the horizontal force acting on $m_{2}$

Thank you for taking part. How I can find the horizontal force acting on m2? Shouldn't it be on m1?
Like I find the acceleration using m2, and then I can find the horizontal force acting on m1. Btw, for m2, I will have to use the total mass of 5 Kg right?

You don't need to consider $\mathbf{F} = ma$ in this explicit manner.

Look at the bottom block. Horizontally, there is an applied force. There is also a frictional force due to the contact between the surface. There is another frictional force between the two blocks.

Sum these forces and you'll find the resultant horizontal force, acting on $m_2$ that is.

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Does the question say find the forces acting on $m_1$ or $m_2$? I'm actually asking, can't read the question.

I can't actually see either :/ But I think it says on m1. I didn't shoot this picture from my book so.

The frictional force acting between the surfaces isn't $\left( 0.5 \right) \left( \mathbf{5}g \right)$ is it?

The reaction force is only $2g \ N$ here.

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The normal reaction on the bottom block on its lower surface is 5g. The normal reaction on the bottom block on its upper surface is 2g.

Use that and the coefficients of friction to find the forces acting.

That's as detailed help as I should be giving you really. If you still can't arrive at the answer, I'd recommend that you speak to your teacher.

I believe that I can reach to the answer with a few more steps, and not need to ask my teacher.

So I can find the acceleration using the bottom object. Then what keeps m1 moving with m2 is the static friction right? I can find it using F = ma

No. If you grapsed about 60% of the content required for this topic, you would be able to take a good stab at the question.

From what I see, you're missing a few fundamentals.