Upthrust

• What is the force exerted by a liquid on a submerged object called?


  Upthrust
• Why does the pressure on a submerged object increase with depth?

  Because the weight of the liquid above increases with depth
• What causes the resultant upward force (upthrust) on a submerged object?

  The higher pressure at the bottom of the object compared to the top
• What is the upthrust equal to?

  The weight of the fluid displaced by the object
• Why does an object float in a fluid?

  Because its weight is equal or less than the upthrust
• What happens to an object denser than the fluid it is placed in?

  It sinks because its weight is greater than the upthrust
• What condition must be met for an object to float in a fluid?

  The object must be less dense than the fluid
• What is the relationship between the upthrust and the weight of the displaced fluid?

  They are directly proportional
• Why does an object less dense than the fluid float?

  It displaces a volume of fluid equal to its own weight before being submerged
• What happens when an object's weight equals the upthrust?

  The object floats
• Why does an object denser than the fluid sink?

  It cannot displace enough fluid to equal its weight
• What is the key factor that determines whether an object floats or sinks in a fluid?

  Density of the object compared to the fluid
• What is the role of fluid displacement in determining whether an object floats or sinks?

  The object must displace a volume of fluid equal to its own weight to float
• What happens to the upthrust if the object is completely submerged?

  It remains equal to the weight of the displaced fluid
• Why does the upthrust not increase indefinitely as an object sinks deeper?

  Because the upthrust depends on the volume of fluid displaced, not depth
• What is the relationship between the object's weight and the upthrust when it floats?

  They are equal
• What is the relationship between the object's weight and the upthrust when it sinks?

  The weight is greater than the upthrust
• What happens to the upthrust if the object is less dense than the fluid?

  It equals the object's weight, allowing it to float
• What happens to the upthrust if the object is denser than the fluid?

  It is less than the object's weight, causing it to sink
• What is the significance of the volume of fluid displaced by an object?

  It determines the upthrust acting on the object
• Why does an object float when it is less dense than the fluid?

  It displaces a volume of fluid equal to its own weight
• Why does an object sink when it is denser than the fluid?

  It cannot displace enough fluid to equal its own weight
• What is the relationship between the object's density and the fluid's density when the object floats?

  The object's density is less than the fluid's density
• What is the relationship between the object's density and the fluid's density when the object sinks?

  The object's density is greater than the fluid's density
• What is the role of pressure in generating upthrust?

  Higher pressure at the bottom of the object creates a resultant upward force
• Why does the pressure on a submerged object increase with depth?

  Because the weight of the liquid above increases with depth
• What is the significance of the resultant upward force (upthrust) on a submerged object?

  It determines whether the object floats or sinks
• What is the relationship between the upthrust and the weight of the displaced fluid?

  They are equal
• What happens to the upthrust if the object is completely submerged?

  It remains equal to the weight of the displaced fluid
• Why does the upthrust not increase indefinitely as an object sinks deeper?

  Because the upthrust depends on the volume of fluid displaced, not depth
• What is the relationship between the object's weight and the upthrust when it floats?

  They are equal
• What is the relationship between the object's weight and the upthrust when it sinks?

  The weight is greater than the upthrust
• What happens to the upthrust if the object is less dense than the fluid?

  It equals the object's weight, allowing it to float
• What happens to the upthrust if the object is denser than the fluid?

  It is less than the object's weight, causing it to sink
• What is the significance of the volume of fluid displaced by an object?

  It determines the upthrust acting on the object