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Updated
2009-02-26 17:05

## Summary

Miscellaneous basic physics formulas and terms.

## Formulas

Result | Formula |

scalar | a single number |

vector | has a magnitude and a direction |

speed | distance traveled / time (a positive scalar) |

velocity | displacement / time (a vector) |

acceleration | velocity / time (a vector) |

acceleration | can occur when the velocity changes direction while the speed stays fixed |

centripetal acceleration | v^{2}/r, the acceleration toward the center of a circle needed to maintain circular motion with radius r and speed v |

Energy | mc^{2} |

frequency | number of waves which pass a given point per second |

specific gravity | SG = density (substance) / density (water) |

P(abs) | P(gauge) + P(atm) |

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#### More Formulas

Result | Formula |

Young's Modulus (for tensile stress) | (F/A) / (dh/ho) |

Shear Modulus | (F/A) / (dx/ho) |

Bulk Modulus | (dP) / (dV/Vo) |

Avogadro's Number | 6.02 x 10^{23} |

acceleration (average) | change in the velocity / change in time |

distance object falls from rest | d = (1/2)gt^{2} |

how fast object falls from rest | v = gt |

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## Terms

Term | Description |

angle of incidence | angle light strikes a surface |

angle of reflection | angle light reflects from a surface |

concave mirror | produces inverted image |

convex mirror | produces smaller upright image |

convex lens | thicker in center (produces inverted image) |

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#### More Terms

Term | Description |

concave lens | thinner in center |

primary colors of light | red, green, blue |

amplitude | distance between resting point and crest or trough |

wavelength | distance between identical points in wave |

acceleration is measured in | m / s^{2} |

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## Miscellaneous

Equation | Meaning |

k_{eq}=[(1/k_{1})+(1/k_{2})]^{-1} =(k_{1} k_{2})/(k_{1} + k_{2}) | equivalent spring constant for 2 springs in series |

k_{eq}=k_{1}+k_{2} | equivalent spring constant for 2 springs in parallel |

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Reference: http://en.wikipedia.org/wiki/Hooke's_law.