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# 9L Pressure & Moment

### questions on pressure and moments @ AJHS

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

What is the pressure on an object equal to? | force per unit area (force divided by area) |

Which scientist is responsible for the principle that an increase in velocity of fluid will result in the decrease in pressure? | Bernoulli |

What is the pressure if the force is 100N on an area of 4m2? | 25 n/m2 |

What happens to air pressure when you drive down from a high mountain? | increases |

If you are walking on snow with snowshoes, what happens to the pressure on the snow? | is less |

When the speed of a fluid increases, pressure? | decreases |

When you go deep into a pool the pressure on your ears? | increases |

What would cause an increase in gas pressure in a sealed, flexible container? | decrease in volume |

The direction of fluid pressure is | perpendicular to the surface of an object |

What is the SI unit for pressure? | Pascal |

What is pressure all around us called? | Fluid pressure also called atmospheric pressure |

Pressure is equal to | force divided by area |

What measures atmospheric pressure | barometer |

Pressure will increase if | the force increases or the area decreases |

What happens to atmospheric pressure as elevation increases? | decreases |

Pascal's principle states that | the force (speed) on a fluid increases, pressure increases |

What does wind do to the smoke coming out of the chimney? | increases it. |

Air at sea level is | is 100,000 N |

Equation used to find pressure | p= f/a |

Barometer | instrument used to measure air pressure |

Fluid pressure | pressure in liquids and gases |

Buoyant force | upward force that is exerted by a fluid |

When air is compressed, density | remians the same |

A fluid is | any substance with no definite shape and can flow |

Atmospheric pressure is | 100,000 PA |

Lift | needed to make an airplane fly |

Density | mass divided by volume |

Fluid pressure | pressure in gases and liquids |

How much pressure is there when 300 n of force is applied over an area of 60 m2 | 5 n/m2 |

What is the pressure if the force is 90n and the area is 15 m2 | 6 n/m2 |

Force = 250n , area = 75m2 what is the pressure | 3.33 n/m2 |

What is the force if the pressure is 16n/m2 and the area is 10 m2 | 160 n |

True or False: Air is more compressed at sea level than high altitudes. | True? |

Which principle states as the speed of a fluid increases, the pressure decreases | Bernoulli's principle |

Pascal's principle | a force applied to a fluid in a closed container, pressure throughout the fluid increases the same amount |

pressure | the amount for force acting on a surface p=f/a |

This is pumped into ballast tanks to decrease density. | air |

Principle that is used to determine buoyant force | Archimedes |

Explains why the buoyant force on a rock that displaces 5N of water is 5N | Archimedes Principle |

Caused by the weight of the atmosphere | atmospheric pressure |

Device used by submarines to control density | ballast tank |

Principle that states that the pressure in a fluid decreases as the fluid's velocity increases | Bernoulli |

Force exerted on an object that increases as the density of the fluid increases | bouyant |

The formula for this is mass/volume | density |

Amount of matter in a given volume | density |

Force that works against the forward motion on a plane | drag |

An object whose weight equals the buoyant force will... | float |

Can be liquid or gas. Takes the shape of its container | fluid |

An upward force on an object that moves in a fluid | lift |

SI unit of pressure | Pascal |

The formula for this is force/area | pressure |

As depth increases, so does this. | pressure |

An object that weighs more than the buoyant force will do this? | sink |

Organ used by fish to stay afloat | swim bladder |

Forward force produced by an airplane's engine | thrust |

Irregular flow of fluids | turbulence |