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# Forces in Fluids

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

Weight | The amount of force pulling down on an object. Expressed in Neutons |

Mass | The amount of matter in an object. Expressed in gm or kg |

Density | The amount of mass in an object compare to it's volume. Formula is D= M/V |

What is the density of water? | 1 gm/ml or 1kg/l |

What can density be used to determine? | If an object will sink or float- the object's bouyancy |

Why do some things float while others sink? | Water has a density of 1gm/ml. If an object has a greater density, it sinks. If an object has a smaller density, it floats |

Displacement | The result of an object pushing a fluid out of the way. The volume of the object that is below the surface of the fluid. |

Displacement | The result of an object pushing a fluid out of the way. The volume of the object that is below the surface of the fluid. |

Buoyancy | The upward force of a fluid on an object |

Fluid | A substance that flows with no shape (a liquid or gas), but can fill the space of its container |

Pressure | The amount of force exerted on an object in a certain area. Formula is P= F/A |

Volume | The amount of space occupied by an object |

How does density affect buoyancy? | The denser the fluid is the more buoyant force it has on an object. |

Archimedes Principle | The weight of the water displaced by an object is equal to the buoyant force. For example, 5 L of water weighs 5 kg. 5 kg x 10 = 50N. Therefore, bouyant force is 50N |

Atmospheric Pressure | The pressure caused by the weight of the atmosphere. |

Pascal's Principle | A change in pressure at any point of an enclosed fluid (i.e. hydraulics) will be transmitted equally to all parts of the fluid. |

Pascal | a unit of force. 1Pa = 1N/meter squared |

Bernoulli's Principle | As the speed of a moving fluid increases, its pressure decreases |

Lift | Upward force on a wing due to high pressure below the wing and low pressure above the wing. |

Thrust | the forward force of an airplane that influences its speed. |

Drag | The force that opposes or restricts movement of a fluid |

Created by:
stober