Physics is an experimental science that uses precisely defined units of measurement. This text emphasizes SI (Systeme International) units, a system that includes the meter (m), the kilogram (kg), and the second (s) as base units for length, mass, and time, respectively. Units play an important role in solving problems, because the units on the left side of an equation must match the units on the right side. If the units on both sides do not match, either the equation is written incorrectly or the variables and constants in the equation are not expressed in a consistent set of units.Trigonometryis used throughout physics. Particularly important are the sine, cosine, and tangent functions of an angle θ. They are defined in terms of a right triangle that contains θ. The side of the triangle opposite θis ho, the side adjacent to θis ha, and the hypotenuse is h. In terms of these quantities we have If the value of the sine, cosine, or tangent is known, the angle can be obtained using inverse trigonometric functions. The Pythagorean theorem also applies to the right
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