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Force and motion book 2 - Coggle Diagram

- - - - Distance/t
    - - s
      - s/t
    - - Velocity
        
        v
        
        m s^-1
        
        A vector
        
        Magnitude
        
        Length of time
        
        At instant
        
        1 more item...
        
        Over period of time
        
        1 more item...
        
        Direction
        
        SI unit
      - Speed
        
        m s^-1
        
        SI unit
        
        Length of time
        
        Over a period of time
        
        Average speed
        
        1 more item...
        
        At instant
        
        Instantaneous speed
        
        km h^-1
    - - Change in VELOCITY per unit time
      - Objects accelerates whenever it's velocity changes
        
        Speed up
        
        Slow down (deceleration)
        
        Change direction
      - Acceleration = 0
        
        Uniform motion
        
        Velocity = constant
        
        (Acceleration) Δv = 0
        
        Objects moving at a constant speed does NOT mean it's in uniform motion
    - - Reaction time
        
        error/measured value *100%
      - Error in measurement
        
        For finest gradation 0.1cm
        
        UNCERTAINTY of ±0.05cm
- - - - Displacement
        
        Can be represented by
        positive (+), negative (-) signs
        
        ALWAYS the same sign
      - Velocity
        
        Average velocity
        
        The sign of the instantaneous velocity tells the moving direction at the instant
      - Non-directional
        
        MUST be ≥ 0
    - - a
      - a = (v - u)/t
        
        CANNOT Tell the direction of motion
        
        Thus CANNOT know if the object is speeding up or slowing down
        
        When a,v have same sign
        
        Speeding up
        
        When a,v have opposite sign
        
        Slowing down
        
        v(final velocity)
        
        u(initial velocity)
  - - - v (velocity) = Slope = (Δs/Δt)
        
        Steeper slope, higher speed
        
        Slope = 0 = at rest
        
        The sign of the slope gives the direction of velocity
        
        If the graph is curved
        
        The instantaneous velocity tells the slope of curve at the instant
    - - Given a and u
        
        s=ut+(at^2)/2
        
        v^2=u^2+2as
        
        v=u+at
      - Given a,u = 0
        
        v=at
        
        s=(at^2)/2
        
        v^2=2as