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# Physics ch 3_

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

What is energy? | The capacity to do work, to make something happen |

What is kinetic energy? | the energy of motion |

What is the equation for kinetic energy? | K = 1/2 mv^2 |

What is the equation for gravitational potential energy? | U = mgh |

How do you determine whether a force is conservative? | If the net work done to move a particle in any round-trip path is zero, the force is conservative. Also, if the network needed to move a particle betwen 2 points is the same regardless of the path taken, it’s conservative |

What is work? | The process by which energy is transferred from one system to another |

What is the equation for work? | W = Fdcos(theta) |

What is power and its equation? | The rate at which energy is transferred from one system to another. P = W / deltat |

What is the work-energy theorem? | The net work done on or by an object will result in an equal change in the object’s kinetic energy Wnet = Kf - Ki |

What is momentum and its equation? | a quality of objects in motion, p = mv |

What is inertia? | the tendency of objects to resist changes in their motion and momentum |

What is impulse? | the change in momentum, a vector quantity |

What is the equation for impulse? | J= Fdeltat = deltap = mvf - mvi |

How do you express conservation of momentum in a collision? | pai + pbi = paf + pbf |

What are the three types of collisions for which total momentum is conserved? | completely elastic, inelastic, and completely inelastic |

What is a completely elastic collision? | both total momentum and total kinetic energy are conserved, meaning no energy of motion has been transformed into another form like thermal, light, or sound, and no energy was used to change the shapes of the objects |

What is an elastic collision? | When a collision resultsi n light, heat, sound, or object deformation, meaning there’s a decrease in the total kinetic energy of the system |

What is a completely inelastic collision? | The objects that collide stick together mavai + mbvbi = (ma + mb)vf |