Lego Balloon Car

Today we had a lego challenge. We had to choose to make a lego bridge, a lego zipline and a lego balloon car. I chose to do a lego balloon car. I used a lego car base, a few random pieces of lego and a balloon. 

I learnt why the car moved forward when I let go of the balloon. It goes forward because of the "newton's third law of motion". This means for every action there is an equal but opposite reaction. So the action of the air rushing out from the balloon is pushing against the air behind the car. The reaction is the air behind the car pushing against the car with the same force causing the car to move forward. 

My favourite part was trying it out because I did not know if it would work. It surprised me when it worked! It also went really far and almost fell of the table!

I found it tricky to make the car because it was kind of hard and it challenged me. It was kind of hard because the balloon would rub against the green bit and make the balloon not blow up. So I found some more pieces and built it up a bit more and I could blow up the balloon more.

Next time I would add more legos because it would make the car heavier and might make it go slower. I also would move my chromebook back so you could see where it landed.

Here is my slide: