Upthrust

    Cards (21)

    • What should you be able to calculate by the end of this video?
      Pressure due to a column of liquid
    • What happens when holes are made in the side of a water container?
      Water squirts out, further from the bottom hole
    • Why does water from the bottom hole squirt out further than from the top hole?
      Because the bottom water is at higher pressure
    • What is the formula to calculate the pressure of a column of liquid?
      Pressure = height × density × gravitational strength
    • What values are provided in the exam for calculating pressure?
      Density and gravitational field strength
    • If a freshwater lake has a depth of 8 meters, what is the pressure at the bottom?
      78,400 Pascals
    • How does pressure change with depth in a liquid?
      Pressure increases with depth
    • How does pressure change with the density of a liquid?
      Pressure increases with density
    • What is upthrust in relation to floating and sinking objects?
      It is the resultant upward force on an object
    • What must upthrust equal for an object to float?
      It must equal the object's weight
    • What happens if upthrust is less than the object's weight?
      The object sinks
    • What occurs when an object is lowered into water?
      The water level lowers due to displacement
    • What is the size of the upthrust acting on an object?
      It equals the weight of water displaced
    • What must an object do to float in water?
      Displace its own weight of water
    • What happens when an object is less dense than water?
      It floats after displacing small volume
    • What happens when an object has the same density as water?
      It floats at the water's surface
    • What occurs when an object is more dense than water?
      It sinks because it can't displace enough water
    • Where can you find more questions on pressure in liquids?
      In the vision workbook
    • What factors influence whether an object floats or sinks?
      Density of the object and water displaced
    • What is buoyancy in relation to floating objects?
      It is the upward force acting on submerged objects
    • How does gravitational field strength affect pressure in liquids?
      Higher gravitational strength increases pressure
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