What is Newton's first law of motion?
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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