Sir Isaac Newton was a physicist and mathematician from the 17th century. He is famous, among other things, for his laws of motion. These laws explain why objects move (or don’t move) as they do.
First law:
Newton's first law, also known as the law of inertia, states that every object in motion or at rest remains in that state unless an unbalanced force is applied to it.
The following video from ESA (European Space Agency) explains very clearly this law:
Second law:
Newton's second law states that the force acting on an object is equal...
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