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# Topic 4 vocab

### Physics Vocabulary

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

Watt (W) | The SI unit of power; a derived unit equivalent to one joule per second: 1 W = 1 J/s |

Spring Potential Energy | The potential energy held in an elongated spring. |

Work | Work is done on an object when a force displaces the object. |

Conservation Of Energy | n any transfer of energy among objects in a closed system, the total energy of the system remains constant. |

Potential Energy | Energy resulting from the position or state of an object. |

Spring Constant | The constant of proportionality in the equation for the force required to stretch or compress a spring: . |

Vertical Velocity | A vector quantity that represents the vertical speed and direction of motion of an object. |

Gravitational Potential Energy | When work is done on an object by moving it against an gravitational field, the objects acquires gravitational potential energy. |

Kinetic Energy | The energy that an object possesses because of its motion. |

Vertical Displacement | A vector quantity that represents the vertical length and direction of a straight line path of motion of an object from its starting point to its finishing point. |

Power | Power is the time-rate of doing work. |

Horizontal Velocity | The horizontal vector component of the velocity of an object. |

Heat | The energy that is transferred from a warm body to a cold body because of the temperature difference between them. |

Projectile Motion | The motion of an object projected by a force and continuing in a path produced by the action of the projecting force and gravity. |

Spring | An elastic body, such as a coil of metal, that recovers its shape after being compressed, bent, or stretched. |

Vertical Displacement | A vector quantity that represents the vertical length and direction of a straight line path of motion of an object from its starting point to its finishing point. |

Total Mechanical Energy | The sum of the kinetic and potential energies in a mechanical system. |

Vector Components | A single vector may be resolved (broken down) into an unlimited number of components such that the sum of the components is equal to the original vector. |

Horizontal Component | Usually we resove a vector into two components perpendicular to each other, one on the x-axis the other on the y-axis The horizontal component of a vector quantity represents projection on the x-axis. |

Internal Energy | The total energy of a system or object, including its potential energy and its kinetic energy. |

Mechanical Energy | A form of energy resulting from physical changes that encompasses both kinetic and potential energy. |

Horizontal Displacement | A vector quantity that represents the horizontal length and direction of a straight line path of motion of an object from its starting point to its finishing point. |

Joule (J) | The SI unit of work and energy; it is a derived unit. |

Power | Power is the time-rate of doing work. |