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# Phys Periodic Motion

### Physics terms associated with periodic (SHM, UCM, gravity) motion.

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

motion that occurs along a specific path at regular intervals | periodic motion |

time interval required for a repeating event to occur | period (T) |

the number of repeating events that occur in a certain time ("rate of occurrence") | frequency |

unit for measuring frequency | hertz (Hz) |

1 Hz = _?_ waves/second | 1 |

math relationship (proportionality) between frequency and period | inversely proportional |

vibration-like motion along a repeating path around a central (equilibrium) point and caused by a 'restoring' force | simple harmonic motion (SHM) |

force that points toward the equilibrium position and is proportional to the displacement of the object (amplitude) from that position | restoring force |

displacement of an object undergoing SHM from its equilibrium position | amplitude |

point along the path of an object undergoing SHM at which the net force is zero (0) | equilibrium position |

gradual increase in amplitude of SHM by applying a small force at regular intervals | mechanical resonance |

kicking feet on a swing, jumping on a trampoline, rubbing finger on stemware rim | examples of mechanical resonance |

the elongation of a spring is proportional to the tension applied to it (within its elastic limit) | Hooke's Law |

slope of the graph of tension force (N) applied to a spring vs. elongation (m) | spring constant |

opposing forces for an object suspended from a spring | tension and weight |

"the period of a pendulum is independent of swing amplitude" (my pulse told me this) | Galileo |

quantity with both magnitude and direction | vector |

speed in a particular direction | velocity |

rate of change of velocity | acceleration |

rate of change of speed in a constant direction | linear acceleration |

rate of change of direction for a constant speed | centripetal acceleration |

means "center-seeking" | centripetal |

force that causes an object to change direction but not speed by acting perpendicular to the direction of motion (at all times) | centripetal force |

distance around the perimeter of a circle | circumference (C) |

a vertical loop with a changing radius ("teardrop") | clothoid loop |

"gravity is directly proportional to the mass of attracting objects and inversely proportional to the square of the distance between their centers"... it's universally true! | Newton |

"I found the universal gravitation constant, G!" | Cavendish |

SI unit of force (and weight) | newton (N) |

SI unit of (linear and centripetal) acceleration | m/s2 |

SI unit of mass | kilogram (kg) |

slowing down downward or speeding up upward | positive acceleration |

slowing down upward or speeding up downward | negative acceleration |

SI unit of coefficient of friction | (no unit) |