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# Pressure

### IGCSE pressure facts

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

Units of force | Newtons |

Units of area | metres squared (or cm squared) |

Units of pressure | Pascals, Pa (aka Newtons per metre squared) |

Pressure = ? | force/area |

Incompressible means ... | can't be squashed. |

At the same depth under water, pressure is the same in ... | all directions |

Hydraulic systems use liquid to transfer.. | pressure from one place to another. |

In a hydraulic system, if the area of the piston is bigger then the force is .. | bigger. |

Hydraulic brakes are force.. | multipliers. |

In hydraulic brakes the pistons that squeeze the brakes onto the discs have a bigger .. | area than the piston in the master cylinder behind the brake pedal. |

In a force multiplier system the effort force (input) is smaller than .. | the load force (output). |

In a car workshop vehicles can be raised with a hydraulic.. | lift. |

A hydraulic press can be used to .. | squash or bend e.g. metal bars. |

The deeper you go under water the greater the .. | pressure. |

force = pressure .... | times area. |

The pressure under my feet is 0.4 N per square cm. The area of my feet is 150 square cm. What is my weight? | weight force = pressure times area = 60 N |

I push with an effort force of 200 N on a piston area 5 square cm. What is the pressure? | 200/5 = 40 Newtons per square cm. |

If the brake pistons have an a total area 20 times the area of the piston behind the car brake pedal, and I push on the pedal with an effort of 30 N. What is the braking force? | Braking force is 20 times effort force = 600N |

The oil pressure in a hydraulic lift is 600 N per square cm. The load piston area is 10 square cm. What is the greatest load that can be lifted? | load force = pressure times area = 6000 N |

On Earth gravity is 10 N/kg. What is the weight of a child mass 40 kg? | 40 x 10 = 400 Newton |