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# Physics - LG

### Ch.1-3

Question | Answer |
---|---|

Problems of the U.S. customary system of measurement is | Some units are historic, many of them are unfamiliar, converting one unit to another is often difficult. |

tera- | Symbol: T Meaning: trillion Power of Ten: 10 to the 12th power Value: 1,000,000,000,000 |

giga- | Symbol: G Meaning: billion Power of Ten: 10 to the 9th power Value: 1,000,000,000 |

mega- | Symbol: M Meaning: million Power of Ten: 10 to the 6th power Value: 1,000,000 |

kilo- | Symbol: k Meaning: thousand Power of Ten: 10 to the 3rd power Value: 1,000 |

centi- | Symbol: c Meaning: hundredth Power of Ten: 10 to the negative 2nd power Value: 0.01 |

milli- | Symbol: m Meaning: thousandth Power of Ten: 10 to the negative 3rd power Value: 0.001 |

micro- | Symbol: upside down h Meaning: millionth Power of Ten: 10 to the negative 6th power Value: 0.000001 |

nano- | Symbol: n Meaning: billionth Power of Ten: 10 to the negative 9th power Value: 0.000000001 |

pico- | Symbol: p Meaning: trillionth Power of Ten: 10 to the negative 12th power Value: 0.000000000001 |

femto- | Symbol: f Meaning: quadrillionth Power of Ten: 10 to the negative 15th power Value: 0.000000000000001 |

Properties | are the qualities or attributes that, taken together, are usually peculiar to an object. |

Measurement | a comparison. a process of comparing a property to a well-defined and agreed-upon referent. The well-defined and agreed-upon referent is a standard called a unit. |

The most two common systems of units are: | The English System and the Metric System (Le Systeme International d' Unites) or SI. |

Length | Metric Unit: meter Symbol: m |

Mass | Metric Unit: kilogrm Symbol: kg |

Time | Metric Unit: second Symbol: s |

Current | Metric Unit: Ampere Symbol: A |

Temperature | Metric Unit: Kelvin Symbol: K |

Amount of Subsance | Metric Unit: Mole Symbol: mol |

Luminous Intensity | Metric Unit: Candela Symbol: cd |

4 Fundamental Properties of the Metric System | Length, Mass, Time, Charge |

The standard unit of Length | meter |

The standard unit of Mass | kilogram |

The standard unit of Time | second |

The value of a second is based off of the vibrations of | the cesium-133 atom |

speed | change in position over change in time d/t distance/time |

velocity | change in position over change in time df - di/tf - ti |

acceleration | change in velocity over change in time vf - vi/tf - ti |

If the acceleration is in the direction of motion it is | positive |

If the acceleration is in the opposite direction of motion it is | negative |

average speed | distance/time m/s |

average velocity | change in position/change in time m/s |

acceleration | change i velocity/change in time m/s2 |

find vf | vi + at |

find vf2 | vi2 + 2ax |

find x | vit + 1/2at2 |

acceleration due to gravity (g) | 9.8m/s2 |

Inertia | an object's tendency to resist changes in it's motion. |

Newton's Laws of Motion | 1 - Inertia 2 - Related Force to Acceleration 3 - Action - Reaction |

Four Fundamental Forces | 1- gravitational 2- electromagnetic 3- strong nuclear 4 - weak nuclear |

1 Newton | 1kg x m/s2 |

Weight (W) | measure of the force of gravity on a mass. Measured in Newtons |

Normal Force (N) | always perpendicular to a surface, surface pushing back, electromagnetic force in nature |