Newton’s First Law Of Motion
Real time Applications:
Importance of seatbelts headrests and airbags in vehicles is the application of I law only
Inertia explains what happens when a car takes sudden turn or stops suddenly.
second law is useful in industries to know how much force the machine has to apply in order to move a body.
In space field newton’s third law and law of conservation of energy playing a wide role in sending a rocket to it’s target
Usefull in understanding motion of bodies bodies in contact with several other bodies.
Usefull in finding motion of bodies connected by string
Important Formulae:
1. P= mv 2. F= ma.
Force:
Force is that which changes or tends to change the state of a body
Force is a vector. It is always in the direction of change in momentum. Force is also always in the direction of acceleration.
SI unit of force is newton (N). If a force acting on a mass of 1 kg produces in it an acceleration of 1 m s-2 in its direction, it is called a newton.
CGS unit of force is dyne. If a force acting on a mass of 1 gm produces in it an acceleration of 1 cm s-2 in its direction, it is called a dyne.
f=ma
-Newton's Laws of Motion
Newton has given three laws to describe the motion of bodies. These laws are known as Newton’s laws of motion.
Newton’s First law: If no external force acts, a body continues to be in its state of rest or of uniform motion along a straight line.
(OR)
If no external force acts, we can also say that “bodies” go on doing what they are doing.