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This concept is known as inertia, where an object will remain at rest or continue moving in a straight line at a constant velocity unless acted upon by an external force according to Newton's first law of motion.
...by an unbalanced force
Newtons 1st law states that every body continues to be in its own state of rest or of uniform motion along a straight path unless it is compelled by any external force to change its state. If a force is exerted on a body the body will move but without force it will not move.
Newton's First Law Of Motion States: "Every body continues in its state of rest of of uniform motion in a straight line unless it is compelled to change that state by an external force impressed upon it"
Force is defined as the one which changes or tends to change the state of rest or of uniform motion of a body along a straight line.
bodies in motion will remain in motion and bodies at rest will remain at rest unless acted upon by a net force.
The law of motion states that an object will remain at rest or in uniform motion in a straight line unless acted upon by an external force. This law is known as Newton's First Law of Motion.
Every body continues in its state of rest or uniform motion in a straight line, unless it is compelled to change by the forces impressed on it. ( Newton's first low of motion ).
Every body continues in state of rest or uniform motion in a straight line until acted upon by an externally applied force.
unbalanced force
Newton First Law of motion states that "A body continues in its state of rest or of uniform motion in a straight line until/unless an external force is applied upon it" Why is it so? "Inertia is the property of a body to resist any change in its state of rest or of uniform motion in a straight line" Newton's first law of motion is also therefore known as law of inertia because of the inertia the body will remain in its initial state forever. And mass is the measure of the inertia of a body.