Newton’s 1st law of motion definition
Newton’s first law of motion states that ” A body continues its state of rest or of uniform motion in a straight line provided no net force acts on it.”
According to newton’s 1st law of motion ,a body at rest remains at rest provided no net force acts on it.This part of law is true when we notice that objects do not move by their own unless someone moves them.
Newton’s 1st law of motion deals with the inertial property of matter therefore newton’s 1st law of motion is known as law of inertia.
Why we need newton 1st law of motion?
From the section of forces we discussed about some properties of forces,but from that section we said nothing about how forces affect motion.
Examples of newton’s first law of motion in everyday life
- A book lying on the table remains at rest as long as no net force acts on it.
- A moving object does not stop moving by itself.
- A rolling ball on rough surface or ground stops earlier than on smooth surface,because rough surfaces offer more friction than smooth surface.If there would no force to oppose then the motion of a body than the moving body would never stop.