A steel needle when placed carefully on water can be made to float. When a detergent is added to the water it sinks. Explain this observation - ATIKA SCHOOL

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A steel needle when placed carefully on water can be made to float. When a detergent is added to the water it sinks. Explain this observation

17/7/2020

K.C.S.E Physics Q & A - MODEL 2009PP1QN03

A steel needle when placed carefully on water can be made to float. When a detergent is added to the water it sinks. Explain this observation

answer

Needle floats due to the surface tension force
Detergents reduces surface tension, so the needle sinks

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Introduction to Physics (4 Lessons)
Measurements 1 (12 Lessons)
Force (16 Lessons)
Pressure (24 Lessons)
Particulate Nature of Matter (12 Lessons)
Thermal Expansion (12 Lessons)
Heat Transfer
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Electrostatics (12 Lessons)
Cells and Simple Circuits (12 Lessons)

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Magnetism (12 Lessons)
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Turning Effect of Force (10 Lessons)
Equilibrium Centre of Gravity (12 Lessons)
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Waves II(10 Lessons)
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Thin Lenses (20 Lessons)
Uniform Circular Motion (10 Lessons)
Floating and Sinking (15 Lessons)
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Mains Electricity (10 Lessons)
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