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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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Viscosity – Friction in Fluids:

When water and engine oil are poured into different containers, it is observed that water pours out easily and faster than engine oil.

Likewise, when a stone is dropped inside the two liquids at the same time, the speed and time of travel are faster in water than in engine oil. These differences observed in them is as a result of a property of liquid called viscosity.

Viscosity is defined as the internal friction between layers of a liquid or gas in motion.

The effect of viscosity is produced due to strong cohesive forces between the molecules.

Liquids that pour slowly are said to be more viscous than those that pour faster. When a stone is thrown into the liquids, the more viscous the liquid is, the more opposition to the movement of the stone, therefore, the slower the motion.

The image below shows three base oils with different viscosities. From left to right the viscosity increases and the oil becomes thicker.

viscocity

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