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 Measurements Errors Random error Systematic error Uncertainty Total uncertainity in addition / subtraction Total uncertainty in multiplication and division Total uncertainty in power factor Total uncertainty in the average value of many measurements Total uncertainty in the timing experiment Total uncertainty in the timing experiment Example 1 - Calculation of uncertainty Least count Spring Balance Digital Balance Protractor Micrometer Vernier calliper Digital Ammeter Cathode Ray Osciloscope

## Spring Balance

```A spring balance can be used for weighting things.

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The uppen end of the spring is hung from a hook and the spring is stetched y the weight of the pan attached to its lower end. The scale then can be adjusted so that the pointer is aligned with the zero mark. The balance can be graduated by placing known mass in the pan.

In the spring balance shown, the pointer should be at the 30 N mark if the scale is set correctly.

If this balance is moved to the moon the weight would be less and spring would not stretch so far. In fact the pointer would indicate a weight of 4.8 N.

So spring balance measures the weight of the object in Newtons.

 Yunzila Said : but we have calculated the value with the given radius then what is the need of division by 2......??? 07/12/17 12:21 PM

 Yunzila Said : why in the ans is 0.6.......??? bcz after calculation we get 1.2.....!!! 07/12/17 12:17 PM

 unknown Said : ^to calculate the radius, diameter needs to be divided by 2. thus, 1.22/2 = 0.61 02/01/15 12:33 AM

 Bilal Said : where did 0.6 come from in result 09/09/14 02:51 PM