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Symbols and units Intro Symbols areto letters used in formulas. Units are letters used in quantities. Note that we can change symbols at any Mechanics is the port of entrytime into physics. A job well done and use whatever symbols we like. in mechanics will form a solid foundation for the rest of the m represents mass Note that you will need to memorize subject. because they are standard Do not confuse symbols with units. t represents time the units F represents force and cannot be changed and they is the unit that identifies kg kilograms for mass areItmandated by law. v represents velocity F m a d what the quantiy represents. s seconds for time W represents work N newtons for force 2 2 etc. etc. 2 a v v s f i m/s meters/second for velocity 20 kg Mass J joules for work 22.5 vs Time a m meters for length Force 400 tN a g Sin x etc. etc. -200 J Energy Introduction Click to continue BASIC QUANTITIES Length UNIT meter Mass kilogram There are three basic quantities in mechanics. Time second All other quantities in mechanics are derived from these basic three and are known as “derived” quantities. Introduction Click to continue Formulas Formulas Formulas Hypotenuse is double opposite side From a past physics exam While the value for g is 9.8 m/s2, for quick practice, you may use 10 m/s2 to simplify your calculations. … and good luck!