Inércia - parado ou em movimento, é assim que vai ficar

Hello, little scientists, I am Professor Bill Tyson and together we are going to know different forms of science. We have already talked a lot about movement and there is a part of the knowledge that studies this, called Mechanics. One of his greatest names was the great scientist Isaac Newton, and today we will speak about one of his studies of Inertia.

Inertia is also called Newton's First Law, and says that if something is stopped it will stand still. And if something is in motion it tends to remain in motion. I'll show you how it works by experimenting with my rocket .

. . it has casters.

Newton says that if something is stopped, t will stay that way until a force is applied. Yeah, looks like it will not move. But Inertia also says, that if something is in motion, it will keep moving.

We will see. Stopped? Why?

Oh! I know! It was the Friction Force, remember?

We may not see it, but in the air we breath there are several gases and as the rocket moves it will collide with them. Not to mention the friction of the wheels with the ground. But I think I already know where we can see this experience working.

Here in space there is no air and no ground, so there is no friction. Let's redo the experience. Wow!

! Inertia works! The rocket went floating.

. . but I do not think he's coming back.

For now, it's just personal, see you next time. Ah! Before I forget!

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