# Newton's First Law

## Key Questions

$\text{Also known as " color(crimson)("Law of Inertia}$

#### Explanation:

Isaac Newton's first law of motion, also known as the law of inertia , states that an object at rest will stay at rest and an object in motion will stay in motion with the same speed and direction unless acted upon by unbalanced force.

It requires more force to start the motion from rest.

color(green)("It is called "INERTIA".

color(blue)("Objects with greater mass have more inertia"

Once started moving, requires less force to continue the motion.

#### 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:

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

• 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 :)