BAB 3

Bab 3

Linear Motion

>An object is said to make a linear motion if its path form a straight line. 

>Therefore, linear motion is also called one dimensional.

1. Quantities of linear motion :

   1. Velocity

   2. Accelaeration

   3. Decceleration

   4. Speed

   5. Length

   6. Displacement

   7. Average value of velocity and acceleration

   8. Instantenous of velocity and acceleration.

   9. Distance

   >Example :

      Distance : 6+8 = 14

      Displacement : Displacement = 10 Km

 

   >The difference between speed and velocity

      Speed = there is direction

      Velocity = there's no direction

   >How to measure ?

      Average velocity = displacement/time duration

      Average speed = distance traveled/time duration

      Instantenous = V=DeltaX/DeltaT

2. Linear Motion woith constant velocity

    If an object moves with zero acceleration, the velocity of the object remains constant which is             exactly equal to the instantaneous velocity.

3. Linear motion with constant acceleration

    At this motion, the velocity of the acceleration remains constant, the average acceleration is                 exactly equal to the instantaneous acceleration.

4. Equation

    1. Provides the relation between initial velocity, find velocity, the time taken to reach it , and the acceleration.

        initial velocity = Vo

        Final velocoity = Vi

        Time taken = t

        Acceleration = a

        Change of vellocity = Vi - Vo

       

                   a = (Vi - Vo)/t     or      Vi = Vo + at

   2. Relation between distance traveled, initial velocity, acceleration, and time

       S = average velocity x time

          = ((Vo + Vi)/2) x t

       Vi = Vo + at

       Substitute for Vi, we get S

       S = ((Vo + Vo + at)/2) x t = Vot + at^2/2 

       S = Vot + at^2/2

   

   3. Realtion between initila velocity, find velocity, acceleration and distane. There's no factor in it.

       Vi = Vo + at

      - Squaring, we get 

         Vi^2 = (Vo + at)^2

                  = Vo^2 + 2Voat + a^2t^2

                  = Vo^2 + 2a (Vot + a t^2/2)

                  = Vo^2 + 2as 

         Vi^2 = Vo^2 + 2as

5. Vertical Object

    This topic discusses about free falling. When an object is free falling, this object will also has the       acceleration which is caused by the G (gravitation). The constant value of acceleration which is           caused by gravitation is 9.8m/s^2 or 10m/s^2. 

    Equation : 

                       Vi = Vo + gt

                       S = Vot + 1/2 gt^2

                       Vi2 = Vo^2 + 2gs

6. Position VS Time 

 

1.

2. 

Answer : 

1. 

2. 

    

7. Velocity : + Vs -