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Units And Measurement

Question

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Under what condition torque acting on body by a given force is zero?

Solution

W e space k n o w space t h a t comma space space space space space space space space tau space equals space r with rightwards arrow on top x space F with rightwards harpoon with barb upwards on top space rightwards double arrow space space space straight tau space equals space r space Fsinθ space

If sin θ = 0 or r = 0

then, θ= 0°, 180°
That is, Torque = 0.

That is, when line of action of forces passes through the axis of rotation, torque is zero.

Some More Questions From Units and Measurement Chapter

Can we use same units for different physical quantities?

Can we use different units to measure same physical quantity?

To measure a physical quantity X, the unit U is repeatedly used for n times. What is the magnitude of physical quantity?

Does the numerical factor in the quantitative measurement depend on the system of unit used?

Is one unit sufficient to measure a physical quantity?

Can a physical quantity have two or more units? Give example.

What are fundamental quantities?

How many fundamental quantities are there in mechanics?

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