Question

Q. What is ' Least Count ' and 'Tension' in Physics ??

Ch :- Motion

Answer 1

hey friend here is ur answer
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Least Count: - The least count of a spherometer is the smallest distance that can be measured with it. It is
the distance moved by the screw when it is turned through one division on the circular scale.
tension : - In physics, tension may be described as the pulling force transmitted axially by the means of a string, cable, chain, or similar one-dimensional continuous object, or by each end of a rod, truss member, or similar three-dimensional object; tension might also be described as the action-reaction pair of forces acting at each end of said elements. Tension could be the opposite of compression.

Answer 2

Heya.......!!!!

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First of all let us talk about ' tension ' .

♦ Tension => Tension is a simply a kind of force . Tension is an electromagnetic force .
Tension force acts when a string is pulled/stretched . If a string is not pulled then we will say that it's Tension is Zero ( 0 ) .

=> SI Unit = As we know that Tension is a Force so it's SI unit will be same as of Force => Newton ( N ) .

=> Tension is denoted by letter ( T ) .

=> Eg.) Imagine a block of mass 10 Kg simply hanging with String and we have to find Tension in it .

First step is to make FBD of block .
=> Tension force will act upwards and Mg will act downwards .

As the block is at rest balance both the force.

=> T = Mg
=> T = 10 × 10

=> T = 100 N

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♦ Least Count => As we know that there are many measurement devices so Least Count is simply the measure upto a perfect accuracy and that is called Least Count . We can also say that it is the smallest quantity that a instrument can measure is Least Count.

For eg.) a scale can measure upto 0.1 cm accuracy then it's Least Count is 0.1 cm.

We basically study Least Count in Ch " Measurement Errors and Experiments . ( 11th class ) .

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