Science 14 : Opposite Directions

Do you know that every force (with directions) have an equal opposite directions? Well, it is already explained in Newton's 3rd law of motion. "Every directed force has an equal opposite directions". For some proof;

1. You stand on the ground on the earth.(Your force is directed to up, but gravity pulls you down)
2. You're holding a big stick about 2 meters high. But your friend kick at the bottom of the stick and the upper parts of the stick goes to your friend's head.(Yeah, this is what happening to me. I hold a stick, and 2 naughty students try to kick the bottom parts. One of them got his head knocked but I was blamed. I'm trying to explain it was the opposite force reactions. And he doesn't know, 'cause this happens when I was in grade 5. The name of the person is Andrean Salim. He makes Youtube videos too. And yeah, I don't know if now he knows about this... I don't like students at my elementary schools well. I explain them scientifically what's causing this, but they all blame me up. So that's why I decided to go to another school when I was in Middle School.)
3. And many else...

And this is the formula : F=m.a

Try to remember it....

Source : Natasha Setianto