Question

(Force
b) What happens to the needles ? How do they move ?
s. They repel each other They move backun​

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11th

Physics

Mechanical Properties of Fluids

Surface Tension

Two needles are floating on...

PHYSICS

Two needles are floating on the surface of water. A hot needle when touches water surface between the needles, then they move:

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ANSWER

A needle(greased) floats on water due to the phenomena of surface tension.The phenomenon wherein the free surface of a liquid acts as a stretched elastic membrane in order to possess minimum surface area is called surface tension. Consider two needles floating on water and we introduce a hot needle in between touching the water surface. As we increase the temperature the surface tension decreases that means the molecular interaction between the molecules decreases so the two needles moves away from each other.

a.Frictional force is applied along the surfaces and depends on contact. hence it is not a repulsive force.

Electrostatic and magnetic forces can be either attractive or repulsive. Here, when two objects are experiencing repulsive force because there may be an electrostatic force or a magnetic force.

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