The three laws of motion - easy as kids' play! by ladyrebecca

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· @ladyrebecca ·
$12.32
The three laws of motion - easy as kids' play!
Who says science is hard, you need to do it a lab, pour over a textbook and try hard to learn formulas and theories? You can do science in the school yard, just as well. In fact, you've been studying physics ever since you were steady enough on your feet to kick a ball.

![newton.jpg](https://steemitimages.com/DQmeLcHRekjU89EChxsmHSm6WudxUXKfmLK6nMkpXUeF9qP/newton.jpg)

You did not know that at the time, but kicking a ball is all about Newton's first law of motion. 

**Isaac Newton** (1642 - 1726) was an English scientist who became famous for resting under an apple tree. Seriously, this is the first thing he is remembered for – resting under a tree! Well, not just that. While he was sitting there an apple happened to fall from the tree and hit him in the head. Newton figured out that there must be a force pulling the fruit to the ground. That is gravity, the force that keeps us all on the ground. If it weren't for that we would fly and drift away.

![Newton 2.jpg](https://steemitimages.com/DQmUgXx16hanyHg5LLgLXbQQRxCrkwiJ6PZb622k1BYr7fd/Newton%202.jpg)
[Source](https://sarahdry.wordpress.com/2014/07/06/did-the-apple-really-fall-on-newtons-head/)

Back to the boy and the ball. Newton's first law is pretty simple. An object at rest, in this case the ball, will remain at rest unless acted upon by a force. The boy applies that force when he kicks the ball. According to Newton, the object in motion will remain in motion unless acted upon by a force. 
So, the ball is in the air – why doesn't it move forever? Well, even if you don't see it, the air is made of gases, which oppose the ball's movement with a force called friction, slowing it down. Then, there's gravity, of course, pulling it to the ground.
When we talk about forces, we speak of strength and direction – that is, how hard did the boy kick it and in what direction. (Surely, not in the direction of the window...that was an accident!)
To honor the famous scientist, force is measured in Newtons.

The second law of motion says that the bigger the mass of an object, the greater the force you need to apply to move it. Pretty basic – if we're talking about a small rubber ball, obviously you don't need to kick as hard as a heavy rugby ball.
In science-speak, this is written as **Force = mass x acceleration**.
If two kids are playing with identical balls, which of them will make it go further? The one who kicks it harder, that is applies a greater force.

![newton3.jpg](https://steemitimages.com/DQmbCFioQFVJ5uCvGmFT8P2BQCQLgge4uy9Vjac7umc1jRh/newton3.jpg)
[Source](https://www.nextgurukul.in/nganswers/ask-question/answer/Sir-please-give-me-some-notes-on-Newtons-Laws-of-Motion-/Force-and-Laws-of-Motion/86615.htm)
What about the third law? Newton discovered that the moment you apply a force to an object, there's always an equal reaction force the object puts on you. This explains why your foot hurts when kicking a heavy ball and don't even think of kicking a rock!

Speaking of measurement units – everyone pretty much can say how big is a centimeter or an inch. We can tall what a kilogram or a pound feels like. But how can we describe a Newton?
If you want to know – 1 N is the force needed to accelerate an object with the mass of 1 kilogram at the rate of 1 meter per squared second. Who'd want to play with a ball that weighs 1 kilogram? That's far too heavy!


### Thanks for reading!

![rebecca-516397.gif](https://steemitimages.com/DQmc7gn6YQqSFCmkvrwRoEQmYfDuk17zAKcEFhPgiiXiDx1/rebecca-516397.gif)
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vote details (60)
@didarulselim ·
nice post, science day by day rising, amazing
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@shagorshikder ·
newton laws...physics.
the system of momentum..
good analysis

thank's for sharing...

@followed and upvoted
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