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# kinematics

### First Section of mechanics physics

Term | Definition |
---|---|

Acceleration | the rate of change of velocity; a vector quantity |

Acceleration due to gravity | “g”: the acceleration a freely–falling object experiences if only gravity is acting |

Area | two-dimensional construct; units meters or centimeters-squared |

Equilibrium | the net force is zero |

Force | an interaction that causes an object to change velocity |

Freely-falling | only gravity acting; ignoring any air friction |

Friction | the force that arises when objects interact due to direct contact between them |

gram | a commonly used mass unit (FYI 28 grams is about 1 ounce) |

Inertia | a property of matter that resistances change in velocity |

Instantaneous speed | the average speed over an infinitesimal time; an “instant” |

kilogram | one thousand grams; the basic unit of mass in the MKS system of units |

Liter | 1000 ml = 1000 cm3 |

Mass (gravitational) | the property of gravitational attraction; every bit of matter attracts every other bit of matter with a force called “gravity” |

Mass (inertia) | the property of inertia is the property that a force acts upon to cause an acceleration |

Mass | one of the properties of matter, manifested as inertia and gravitational attraction |

Meter | the basic unit of space in the metric system of units |

Motion | an object passing through space and time |

Net Force | the sum of all the forces acting on an object |

Newton | the unit of force; 1 Newton = 1 kg m/sec^2 |

Scalar quantity | a quantity that requires only one number to specify it, the magnitude |

Second | the basic unit of time in both the English and metric unit systems |

Speed (Average) | the quotient of (change in position)/(time taken for that move) |

Speed | the rate of moving through space; m/sec; cm/sec; miles/hour; kilometers/hour |

Support force | the force that acts upwards on an object; generally equals the weight if an object is at rest. |

Vector quantity | a quantity that has both magnitude and direction (force, position, velocity, acceleration...) |

Velocity | speed with direction |

inertia | Generally stated as the resistance to change in motion |

Volume | three dimensions |

Weight | the support force opposing the attraction by a planet for an object |

Weight | the support force opposing the attraction by the earth for an object (some authors use this differently) |