Force and laws of Motion

PHYSICS

Force and laws of Motion

• Force:- It is an external effort in the form of push or pull Which changes the initial State of object or tries to change it.

  • It is a vector quantity

  • It's S.I. Unit is Newton (n) or (kg M/s²) 

  • It is of two types

   1. Balanced Force :- If a number of forces are acting on a object but the it's resultant is zero, the forces are said to be in balanced force.

   

  2. Unbalanced force :- If a number of forces are acting on an object is displaced from its initial position, the forces are said to be unbalanced.

Inertia :- It is the inherent properties of an object by vurtue of which it resist any Change in its initial state.

 • It was given by Galileo Galilei, So it is            also gallieo law of inertia

   • It is of three types

      • Inertia of rest :- the properties of an object due to which an object in rest, Will continue in the state of rest unless it is acted by Some External force.

 Example:- We feel jurk in backward direction when a bus starts suddenly.

      • Inertia of Motion :- The property of an object due to which an object in motion will continue in state of motion unless it is acted upon by some external force

Example:- We feel jurk in forward direction when a bus stops suddenly

• Interia of direction :- It is property of an object due to which an object moving in one direction will remain the Same direction unless it is acted upon by some external force.