Physics - Mechanics

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Mechanics - Kinematics 2.1.1

  • Displacement - Distance travelled in a particular direction.
  • Velocity - Distance travelled in a certain direction in 1 second.
  • Speed - Distance travelled in 1 second.
  • Acceleration - The change in velocity in 1 second.
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Mechanics - Kinematics 2.1.2

  • Instantaneous values of speed, velocity and acceleration is the value at a single moment in time, not over a period of time. Average values of all three are the average values of the speed/velocity/acceleration over a certain period of time, not just a single moment.
     
  • Average velocity is the difference between the beginning and the end.
    e.g. distance = 16km, journey time = 4 hours
    average velocity = 16/4      
                            = 4 km h^-1
  • Average velocity = displacement/time
     
  • Average speed = distance/time

  • Average acceleration = change in velocity/change in time
    unit of acceleration is m s^-2
    Acceleration is a vector quantity 
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Mechanics - Kinematics 2.1.3

  • The equations of uniformly accelerated motion can only be under conditions where the acceleration is constant.
  • SUVAT used for uniformly accelerated motion:
    • v = u + at
    • s = (u + v/2) t
    • v^2 = u^2 + 2as
    • s = ut + 1/2at^2
    • s = vt - 1/2at^2
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Mechanics - Kinematics 2.1.6

  • Air resistance eventually affects all objects that are in motion. Due to the effect of air resistance objects can reach terminal velocity. This is a point by which the velocity remains constant and acceleration is zero.
  • In the absence of air resistance all objects have the same acceleration irrespective of its mass.
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Physics

  • Instantaneous velocity is how fast it’s going at that moment in time and in which direction.
  • Average velocity is the difference between the beginning and the end.
    e.g. distance = 16km, journey time = 4 hours
    average velocity = 16/4      
                            = 4 km h^-1
  • average velocity = displacement/time
  • Instantaneous velocity = length/time for object to pass
  • Acceleration = change of velocity/time
    unit of acceleration is m s^-2
    Acceleration is a vector quantity 
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