First of all, I am really sorry if this question is bad. I was thinking about the second law of motion, the famous $F=ma$. I was trying to get the idea behind this equation, I got some ideas but I am not able to use them to make this equation. I don't know advanced math, because I am in 9th grade. I can't just accept this equation until I make it on my own, so that I can understand each thing behind this.
Some information that I got :
1) As applied Force increases, the object accelerates faster, which means that Force is directly proportional to acceleration.
2) If I keep on increasing the mass of the body, and apply the same force, then the body accelerates less.
Now, can someone please help me to form the equation, so that I can think intuitively of what is actually happening?
One observation of mine: The ratio between the force and acceleration is the mass of the body, by this equation, why does this happen?
I would be really happy if I can imagine the meaning of this and move on.