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SS1: PHYSICS – 3RD TERM

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  1. Production of Electric Current | Week 1
    6 Topics
    |
    1 Quiz
  2. Electric Current | Week 2
    5 Topics
    |
    1 Quiz
  3. Electrical Resistance of a Conductor | Week 3
    5 Topics
    |
    1 Quiz
  4. Particulate Nature of Matter | Week 4
    5 Topics
    |
    1 Quiz
  5. Crystalline and Non-crystalline Substances | Week 5
    3 Topics
    |
    1 Quiz
  6. Elastic Properties of Solids | Week 6 & 7
    4 Topics
    |
    1 Quiz
  7. Fluids at Rest & in Motion | Week 8 & 9
    6 Topics
    |
    1 Quiz
  8. Solar Collector
    3 Topics
    |
    1 Quiz



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Speed of Object Falling Through Viscous Fluid:

When an object, such as a stone, falls through a liquid, three forces act on it.

1. U – Upthrust of the liquid on the stone acting upwards.
2. W – Weight of the stone acting downward.
3. V – Viscous force acting upwards and opposing its motion, therefore, the equation.

terminal velocity
Motion of sphere in a viscous liquid.
speed of object in liquid 2
Terminal velocity.

W – V – U = ma

a = acceleration of the stone through the liquid

m = mass of the stone

As the stone falls faster through the liquids, the vicious opposing force (weight) of the stone, hence a = 0, because v = constant. Therefore, 

W – V – U = ma = 0

or

V = W – U

This constant velocity is called terminal velocity. Terminal velocity is achieved when any object moves through a liquid. The resistance force by the fluid equals the force causing the object’s motion through the fluid.

Objects released from an aeroplane attain terminal velocity before reaching the ground.

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