Final answer:
Newton's First Law of Motion, also known as the law of inertia, states that objects at rest tend to stay at rest and objects in motion tend to stay in motion with the same speed and direction, unless acted upon by an external force.
Step-by-step explanation:
Newton's First Law of Motion, also known as the law of inertia, states that objects at rest tend to stay at rest and objects in motion tend to stay in motion with the same speed and direction, unless acted upon by an external force. This law is based on the concept of inertia, which is the resistance of an object to changes in its motion. For example, a soccer ball will remain at rest until someone kicks it or an external force acts upon it to put it into motion.
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