pressure

• crisp packet expands because pressure on the outside is lower than the inside making it expand to balance out pressure levels
• the higher up in the atmosphere the lower the pressure. air decreases so less particles therefore less collisions so lower pressure
• what does pressure in a liquid depend on

  density of a liquid

  depth or height of liquid

  gravitational field strength
• PRESSURE

  the effect of a force over a certain surface area
• why do camels feet not sink

  it has a larger surface area so weight is spread out meaning pressure is smaller
• why are needles pointy

  less surface area so more pressure
• pressure in gases are caused by particles colliding with eachother objects and container walls
• UPTHRUST

  the upwards force on an object provided by a fluid
• constant lifting force

  lifting force is at its lowest because upthrust is pushing upwards therefore it appears less heavy
• when an objects floats the upthrust is larger than the weight of the object
• when an object sinks the upthrust is smaller than the weight of the object
• upthrust is equal to weight of fluid displaced
• lowest stream of water comes out fastest as theres a higher weight of water on top meaning theres a higher pressure
• U-TUBE MANOMETER

  pressure of the gas pushes the liquid down
• when coins are spread out force stays the same but pressure decreases as there is a larger surface area
• how to measure total pressure on an object

  pressure due to water + atmospheric pressure
• what does the term unbalanced force means

  the overall or net force on an object
• equation for pressure in a liquid

  pressure = depth x density x gravity
• whats the equation for weight

  mass x gravity
• whats the equation for pressure

  force/area