# Newton's First Law

Introduction to Newton’s First Law of Motion

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## Key Questions

• Newton's first law of motion, often referred to as the law of inertia, says that every object tends to continue its state of rest or of uniform motion until and unless an unbalanced force acts upon it.

That's it :)

#### Explanation:

Inertial mass is the measurement in which how difficult it is to change the velocity of an object.

Using Newton's second law, stating the formula:

$F = m a$ where F is force, $N$, M is mass in $k g$, and A is acceleration in $m / {s}^{2}$

This, therefore, can be re-arranged to find out the mass:

$m = \frac{f}{a}$

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