SS1: PHYSICS – 3RD TERM
Production of Electric Current | Week 16 Topics|1 Quiz
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Energy used in Generating Electricity - Heat Energy
Energy used in Generating Electricity - Solar Energy
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Electrical Resistance of a Conductor | Week 35 Topics|1 Quiz
Particulate Nature of Matter | Week 45 Topics|1 Quiz
Crystalline and Non-crystalline Substances | Week 53 Topics|1 Quiz
Elastic Properties of Solids | Week 6 & 74 Topics|1 Quiz
Fluids at Rest & in Motion | Week 8 & 96 Topics|1 Quiz
Solar Collector3 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.
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
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.