Newton's first law of motion is also called the law of inertia. Why?

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(N/A) According to the first law of motion,a body at rest remains at rest,and a body in motion continues to move in a straight line at a constant speed unless acted upon by an external unbalanced force.
This inherent property of a body to resist any change in its state of rest or uniform motion is known as inertia.
Since the first law of motion defines this property,it is commonly referred to as the law of inertia.

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State Newton's first law of motion.

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The first law of motion is also known as Galileo's law of inertia.

$A$ block is supported by a cord $A$ from a rigid support,and another cord $B$ is attached to the bottom of the block. If you give a sudden jerk to $B$,it will break. But if you pull on $B$ steadily,$A$ will break. Why?

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