Credits: Pixabay.com Newtons First law of motion defines force and inertia. According to Newtons first law of motion, an external force must act on a body to bring about a change in the state of rest or uniform motion in a straight line. This leads us to define force. Force is that which changes or tends to change the state of rest or of uniform motion of a body in a straight line. From first law itvis clear that a material body by itself is unable to change its state of rest or of uniform motion in a straight line. This inability of a body to change by itself its state of rest or state of uniform motion along a straight line is called Inertia of the body. Newton's first law defines inertia and hence it is described as law of inertia. Quantitatively, mass is the measure of inertia. Print Page <<PREVIOUS Newtons 1st Law of motion
Credits: Pixabay.com The law states that"everly body continues in its state of rest or uniform motion along a straight line, unless it us acted upon by some external force to change that state". Thus is often paraphrased as "zero net force implies zero acceleration", but this is an oversimplification. As formulated by newton, the first law is more than a special case of the second law. The significance of the first law is to establish frames of reference for which the other law are applicable, such frames being called Inertial Frames. The net force on an object is the vector sum of all the forces acting on the object. Newton's First law says that if this sum is zero, the state of motion of tge object does not change. Essentially, it makes the following two points. • An object that is not moving will not move untill a net force acts upon it. • An object that is in motion will not change it's velocity untill a net force acts upon it. The first poi