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The First Law of Motion


 Newtons Laws – The First Law of Motion

The first Law of Motion, also known as the Law of Inertia, was discovered by Isaac Newton.

It basically explains what happens with two forms of object – one in motion and one at rest. This law is best explained in a zero friction, zero air resistance,zero gravity environment, as these two forces can  confuse a person that is new to these laws, there is enough to take in without being confused so in the first part of the video below i include friction, air resistance and gravity, but then in the second part i exclude them, which makes the law a lot easier to understand.


The simplest way to understand the first law of motion is to imagine a childs box pulling cart with a ball in it. As the child goes to walk with the cart, the ball will roll to the back of the cart until it hits the end of it.  Similarly, if the child stops suddenly, the ball will go from the back of the cart to the front until it is stopped by the front wall.

This is an example of the ball resisting changes in its motion, when it is at rest in the box cart it wants to remain that way, when it is in motion it also wants to stay that way, however on both occasions the ball is made to stop or move by the front and back walls of the box cart.

Below is the video showing the first law of motion in more detail –