physics

• Motion


  is defined as the change of position of an object in a specific span of time relative to an observer.
• Motion


  requires position and time
• Motion Descriptors

  • Time
  • Distance and Displacement
  • Speed and Velocity
  • Acceleration
• Time


  It is measured in terms of seconds (s) and usually noted by t.
• Time 


  It is a necessary parameter to describe and to observe changes in a specific space.
• Time


  It is a quantity that describes when an event took place.
• Distance

  it describes how far an object has traveled.
• Distance


  It pertains to the total length traveled by an object in motion
• Type of Quantity of Distance

  Scalar
• Displacement 


  It is the length and direction of the line that connects the initial position to the final position.
• Displacement 


  it describes how 'far' an object is from its initial position
• Type of Quantity of Displacement

  Vector
• Distance 


  is always greater that or equal to displacement
• Distance and Displacement 


  These two quantities can only be equal if the object in motion travels towards one direction only and does not go back to its original position.
• Kinematics

  • study of geometry in motion
  • branch of physics
  • motion
• motion

  • points
  • object
  • system of group/objects
• formula of speed

  s = distance/time
• formula of velocity

  v = displacement/time
• Speed and Velocity 


  These are quantities that combine the concept of time and space.
• Speed


  is the rate of change in position. It can be noted as v or s and has a unit of m/s or ms-1.
• Velocity


  is the rate of change in position with respect to a reference point. The direction on how the object moves is important in determining velocity.
• Speed


  describes how fast an object is changing its position within a span of time
• Type of Quantity of Speed

  scalar
• Type of Quantity of Velocity

  Vector
• Acceleration 


  It describes how an object changes its velocity per elapsed time.
• Acceleration 


  It is a vector quantity with an SI unit of m/s2.
• Signs of Acceleration

  • Positive Acceleration
  • Negative Acceleration
  • Zero Acceleration
• Positive Acceleration 


  a and v are of the same direction ⟶ speeding up
• Negative Acceleration (deceleration) 


  a and v have opposite directions ⟶ slowing down
• Zero Acceleration 


  object is travelling at constant v or not moving at all
• signs of Acceleration

  positive, negative, zero acceleration
• three ways to say that an object is accelerating (1)

  if the magnitude of the velocity of the object is changing
• three ways to say that an object is accelerating (2)

  if the direction of the motion of the object is changing
• three ways to say that an object is accelerating 


  if both the magnitude of the velocity and the direction of the motion are changing