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# Applied Physics

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

What is speed? | A measure of how fast something is moving. |

How would you measure speed? | |

What is acceleration? | The rate at which velocity is changing. |

What is a vector? | An arrow whose length represents the magnitude of a quantity and whose direction represents the direction of the quantity. |

What is a scalar? | A quantity in physics, such as mass, volume, and time, that can be completely specified by its magnitude, and has no direction. |

What is Newton's First Law? | When an object is in motion, it stays in motion. When an object is at rest, it stays at rest. |

What is inertia? | The reluctance of any body to change its state of motion. Mass is the measure of inertia. |

Newton's Second Law | The acceleration produced by a net force on a body is directly proportional to the magnitude of the net force, is in the same direction as the net force and its inversely proportional to the mass of the body. |

What is the relationship between acceleration and force? | Ex. Apply force to a hockey puck that was at rest, it starts to move. Since it wasn't moving before, it has accelerated - it has changed its motion. When the stick is no longer moving it, the puck is at a constant velocity. |

What is the relationship between acceleration and force (continued)? | Apply more force to the puck, the motion changes again. The puck accelerated. Force causes acceleration. |

What is momentum? | Inertia in motion, or, the mass of an object multiplied by its velocity. |

What has momentum? | Anything that moves at great force (ex. a moving train). |

What is impulse? | A measure of force and time. |

What is the relationship between momentum and impulse? | The greater the impulse exerted on something, the greater will be the change in momentum. |

What is kinetic energy? | Energy in motion. Equal (nonrealtivitiscally) to half the mass multiplied by the speed squared. |

What is potential energy? | Energy of position, usually related to the relative position of two things, such as stone and Earth, electron and a nucleus; stored and held in readiness. |

What is a situation where one type of energy turns into the other? | As you draw back a stone in slingshot, you do work stretching the rubber band. The rubber band then has potential energy. When released, the stone has kinetic energy equal to the potential. |

Where does charge come from in an electric circuit to light a light bulb? | Battery pushes the charge, carried through wires, then works when it touches something metal. |

Transverse Wave | Medium of the waves moves perpendicular to another wave. |

Longitudinal Wave | Medium of the waves moves parallel to another wave. |

Frequency | How many waves go by in a second. |

Constructive Interference? | Crest of a wave moves through another crest. |

Destructive Interference | Crest of a wave moves through a trough. |

Crest | Highest point of a wave. |

Trough | Lowest point of a wave. |

Standing Wave | Two waves of the same amplitude and wavelength to make areas that move a lot. |