Newton's first law of motion, also known as the law of inertia, states that an object at rest stays at rest, and an object in motion continues to move at a constant speed in a straight line unless acted upon by an unbalanced force. This means that objects behave predictably; they will not start moving or change their motion unless a force causes them to do so. For example, a ball will not roll off a table unless a force acts upon it, such as being kicked, and a moving object will not alter its speed or direction without an external force acting on it[2][3][5].
The law incorporates two key ideas:
An object at rest cannot move unless a force is applied.
An object moving at a constant speed cannot change its speed or direction without an unbalanced force acting upon it[3][4].
In essence, this law signifies that forces need to be unbalanced in order to change an object's state of motion[1][5].
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