Physics G481

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Scalar quantity - has only magnitude (size)

Example: temperature, volume, distance, speed, mass and time

Vector quantity - has both magnitude and direction

Example: force, velocity, acceleration and displacement


  • Distance
  • Displacement - distance moved in a certain direction (s)
  • Speed - change in displacement/ change in time (v)
  • Velocity - change in displacement/ change in time (v)
  • Acceleration - change in velocity/ change in time (a)
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Newton's Second Law         

F = m a

F = total force                M = mass               A = acceleration


  1N = 1kg x 1ms-2

Aristotle theory:

Heavier objects fall faster

Galileo theory:

All objects (irrespective of it's mass) have the same acceleration.

Two balls of different masses reach the ground at the same time.

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Einstien's special theory:

Mass of particles increase as its speed approaches the speed of light (This is why we cannot directly apple F = ma)

Factors affecting drag force:

  • Drag ∝ (speed x speed)
  • Drag ∝ cross-sectional area
  • Drag depends on viscosity (Air temperature)

Terminal Velocity:

  • Weight = Drag
  • Net force = Zero
  • No acceleration
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Thankyouuuu :)

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