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# Physics

### First Half

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

What is accuracy? | How close your measurement is to an accepted value. |

What is precision? | Your ability to get similar measurements in a row. |

What is the SI prefix for 100? | Centi |

What is a vector? | A magnitude with a direction. |

An object's velocity is graphed, what can be determined from its slope? | Its acceleration. |

What is the path of a projectile called? | A trajectory |

When is the sum of two vectors zero? | When the of magnitude of each is equal and opposite. |

Define force. | A push or pull. |

What is the weight of a 1kg object? | 9.81N |

What is the stickiness between two sliding surfaces? | The coefficient of kinetic friction. |

Define work. | Force done over a distance. |

Does a penny falling at 20,000mph have much inertia? | No, it does not have much mass. |

Kinetic energy is also equal to what? | Net-Work. Also, the initial potential energy is equal to the final kinetic energy. |

Power is measured in what? | Watts. |

In inelastic collisions, kinetic energy is __ _______. | Not conserved. |

Elastic potential energy is | Energy stored when deforming object. |

Work, Potential energy, and Kinetic Energy, are measured in what? | Joules (J) |

Equilibrium is... | When net force is zero. |

What is Newton's first law? | Law of inertia. This resist changes in motion |

What is Newton's second law? | Force is equal to mass multiplied by acceleration. |

What is Newton's third law? | Every action has a equal and opposite reaction. (wall pushes back if you lean on it) |

What happens to kinetic energy when velocity is multiplied by 4? | KE=1/2*m(4v)^2 KE=1/2*m16v KE=8*m It is multiplied by 8. |

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