Hello dear students we have learnt that, force is required to change the state of object. Force is the physical quantity that can change the state of object from rest to motion or from motion to rest. Force is responsible to produce any kind of motion or to stop the motion. To pull the trolley, to stop cycle or to shift the cupboard from one corner to another of your house force is required.
Following are some important types of force:
Gravitational force holds the solar system, due to which the planets are bound to rotate in the fixed orbit around sun. Every object is pulled or gets attracted towards the centre of planets with certain force is nothing but the gravity.
Electrostatic force binds the negatively charged electron to rotate in fix orbit around the positively charged nucleus. Structure of atom is completely balanced by presence of electrostatic force between electron and proton.
Aristotle fallacy
According to Greek philosopher and Scientist, an external force is required to keep the body in motion. Some resistive forces like air resistance, frictional drag and the most important term i.e. inertia of object has impacts on the motion. These forces oppose the motion and hence external forces are necessary for motion.
Let’s learn the Newton’s first law of motion….!
Sir Isaac Newton proposed three laws to explain concept of mechanics with more easier and illustrative method.
Statement: An object remains in state of rest or state of uniform motion along straight line unless and external unbalanced force acts on it.
First law of motion explain us the idea of inertia, that unbalanced force is necessary to change the state of object from rest to motion or from motion to rest. This applied force should overcome inertia of object so change the state of object.
Importance of Newton’s First Law of Motion:
- Newton’s first law explains relation between ‘state of rest’ and ‘state of uniform motion along a straight line’. Both need a net unbalanced force to change the state and the characteristics are explain with the help of frame of reference used to explain it.
- Actual meaning of force and its definition can be given from this law. It defines force as quantity that produces change in motion of body i.e., force is something that initiates a motion or controls a motion.
- It defines inertia as a fundamental property of every physical object by which the object resists change in its state of motion. Also gives that the ‘mass’ of object as fundamental inertia of body.