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  Characteristics of uniform motion :

1. Same distance is covered (traveled) in equal intervals of time.
2. Distance Time graph shows a straight line.    s = v t
3. Speed is constant. If the body is moving in a straight line, velocity is constant
      and    acceleration is zero. There is no net force acting on the body.
         Displacement always  increases and is in one direction.

4. If body is moving in a circle, the speed v is constant and acceleration = v²/R .
  points towards the center of circle. There is a centripetal force
     acting on the body.   
     Displacement increases and decreases in magnitude and changes in
      direction.    Centripetal force is constant. 
Bodies moving in uniform speed

1. Earth rotates around itself with a people on the surface moving at a uniform
          tangential speed (almost)
       So all of us are moving with a uniform speed (tangential) in circles, with 
       respect to a stationary observer outside earth. We have not taken into 
       account the revolution of earth around Sun here.

              Our speed = radius of earth * angular velocity
                          = 6400 km * 2 π / 24 hours = 1675.5 kmph

2. Trains and air planes move with uniform speed in between halts. Near 
     stations or airports, they accelerate or decelerate.  An express train 
     covers usually around 60 km in 3/4 hour non-stop between two big stations.
                 average speed  =  60 / (3/4) = 80 kmph

5.  Speed of Birds flying in air = distance traveled / time = 15 meters /sec
          = 54 kmph

7. Hard disk inside the computer.  It rotates at uniform speed.
          speed = 4,000 rpm - 10,000 rpm

9. Light wave moves at uniform speed of c = 3 * 10^8 m/sec            

10. A fan (ceiling) rotates at a uniform speed, same with the blade in a 
      kitchen - mixie or mixer.
       Tip of Fan wing : radius = 0.80 meter,  
        smallest speed = 5 rotations per sec
        Angular speed = 5 * 2 p radians/sec = 10 p rad/sec
         Uniform Linear speed of the tip (far end of a wing)  
                      = 0.80 * 10 p m/sec = 25.13m/s = 90.5 kmph

11. Blood inside our body moves (circulates) at uniform speed
         Pulse rate = 72 /min    
               Average distance from heart to a hand/leg  = 2.5 m
         Speed of blood flow = around   2.5m * 72 / min
                         = 180 m / min = 180 * 60/1000 = 10.8 kmph

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