In physics, it is important to know how precisely some value. The most exact way to do it is use of uncertainty.

The formula is

uncertainty = based value * the percent uncertainty / 100

Example 1.

The mass of the body is 50 kg and uncertainty is ±1 kg.

Let’s calculate the percent uncertainty.


m=50kg (±2%)

Example 2.

The force is 20 N and the percent uncertainty equal 5%.

Let’s calculate uncertainty.


F=20±1 N


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