12 Physics Chapter No. 1 Rotational Dynamics Page 1


12 Physics

 Chapter No. 1

 Rotational Dynamics

         1)      https://youtu.be/Q32Wra3ZonA  
        

         

Introduction: 

Kinetics: 

  1. Kinematics : in this chapter we describe various motion without discussing their cause. Various parameter discussed in kinematics are distance , displacement, speed , velocity  and acceleration

  2. Dynamics: In dynamics we describe the motion along with its cause , Which is force or torque. Parameters discussed in dynamics are momentum , force , energy, power etc.

Everyday life we came across several revolving objects(rigid body). During revolution the particle of the object follow a circular path about some point.





G:\Greater-Radius-Greater-Tangental-Velocity.gif

    Rotation-and-Revolution.gif    


Direction of angular quantities by right hand thumb rule 

If we curl  fingers in the direction of revolution of particle in circular motion the outstretched thumb gives the direction of angular quantities.



The maximum speed with which vehicle can negotiate the curved path is called the safe speed. If the speed is more than that safe value it will skid away that is outward.


Banking of a road 

The process of raising outer edge of the road over its inner edge through certain angle is known as banking of road.
 Angle of banking: The angle made by the surface of road with horizontal surface is called angle of banking.

M= mass of the vehicle       
 r = Radius of curve path W=Mg= weight of vehicle
N= normal reaction
f  = frictional force
V= speed of vehicle
θ = angle of banking
For a particular road, r and θ are fixed. Thus, this expression gives
us the expression for the most safe speed (not a minimum or maximum speed) on this road.



Page 2.   Link

https://physicsmamjkc.blogspot.com/p/12-physics-chapter-no1-rotational.html

Page 3  Link 
https://physicsmamjkc.blogspot.com/p/12-physics-chapter-no-1-rotational_30.html
 
Chapter No. 2 Mechanical Properties of fluids
Page 1 Link  

https://physicsmamjkc.blogspot.com/p/12-physics-chapter-2-mechanical.html

Page 2 Link 

https://physicsmamjkc.blogspot.com/p/12-physics-chapter-2-mechanical_19.html

Page 3 Link 

https://physicsmamjkc.blogspot.com/p/12-physics-chapter-no-2-mechanical.html


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