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# Physics Test #3

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

The product of the mass of an object and its velocity or p=mv | Momentum |

Pascals Princple deals with | Pressure |

Pressure id defined as the ratio of force to area exerted on by a fulid | Pascals Princple |

pressure extends uniformly in all directions through a fluid which explains the operation of hydraulic systems | Pascals Princple |

P=f/a | pressure formula |

We can measure atmospheric pressure by | determining the height of a column of mercury supported by the atmosphere |

atmospheric pressure decreases with | increasing altitude |

The density of air changes with altitude because a lower pressure leads to a larger volume | Boyles Law |

In a fluid pressure increase with depth | producing a buyoant force on objects submerged in the fluid |

Force is equal to the weight of the fluid displaced by the object | Archimedes principle ex ice floating in water |

The rate of flow of a fluid is.. | equal to the speed times the cross sectional area. |

In continous flow the speed increases | if the area decreases |

Fluids with high viscosity have | a greater resistance to flow than those with low visocity. |

As the flow increases the flow may change from laminar (smooth) | to turbulent flow |

energy considerations require that the kinetic energy per unit mass of a fluid increase as the pressure decreases | Bernoullis Princple |

Can be used to explain the curve of a curveball | Bernoullis Princple |

Density | mass/volume |

Pressure | p=f/a |

Viscocity | the property of fluid that determines the strength of frictional forces between the layers of fluid |

The larger the viscocity | the larger the frictional force |

Rotational motion | rotational displacment is described by an angle 0 |

Rotational velocity | the rate of change of an angle with time w= 0/t |

Rotational acceleration | the rate of rotational velocity with time a=w/t |

Torque | what causes an object to rotate |

Torque | force times the lever arm of the force which is perpendicular distance from the line of action of the force to the axis of rotation |

if the net torque is zero | the object does not change its state of rotation. |

rotational interia depends on | the distribution of mass about an object |

angular momentum | the rotational interia times the roational velocity |

fulcurm | pivot point |

Center of gravity | the point about which the weight of the object itself exerts no net torque |

Conservation of momentum | the net force external force acting on a system is zero the total momentum of the system is a constant |

impulse | the average force acting on an object multipied |

Recoli (football player problem) | p1=-p2 |