# Physics notes

Jun 17th, 2015
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Beat frequency – Differences between frequencies played. Sound in a tube: Fundamental frequency is when ¼ λ is in the tube. Natural Frequency – frequency at which an object will vibrate when disturbed.Forced vibration – happens when an o

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Physical quantitiesThe foundation of physics rests upon physical quantities in terms of which the laws of physics are expressed.Therefore, these quantities have to be measured accurately.Among these are mass, length, time velocity, force, density, temperature, electric current, and numerous others.Physical quantities are often divided into two categories: base quantities and derived quantities.Derived quantities are those whose definitions are based on other physical quantities. Velocity acceleration and force etc. are usually viewed as derived quantities.Base quantities are not defined in terms of other physical quantities.The base quantities are the minimum number of those physical quantities in terms of which other physical quantities can be defined.Typical examples of base quantities are length, mass and time.LengthLength is the distance between two points.S.I. unit of the length is meter (m).Note: Length is a scalar quantity.Length-MeasurementLength can be measured using micrometers, vernier calipers, rulers and measuring tapes.Measurement of LengthA metre rule and a measuring tape can be used to measure length. These two instruments provide an precision of 0.1 cm. When using such instruments,parallax errormust be avoided. Taking several readings of the subject to be measured can also help to reduce reading errors.Vernier CalipersVernier calipers can be used to measure up to a precision of 0.01 cm. The advantage of a pair of vernier caliper

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