When an object is submerged in a liquid, there is a greater height of liquid above the bottom surface than above the top surface - The bottom surface experiences a greater pressure than the top surface and this creates a resultant force upwards
What is upthrust?
The upwardsforce exerted by a fluid on a submergedobject
When does an object float?
When its weight is equal to the upthrust
When does an object sink?
When its weight is greater than the uprthrust
The density of an object indicates if it will float or sink
An object less dense than the liquid : displaces a volume of liquid greater than its own weight so that it will rise to the surface - will float with some of the remaining below the surface - displaces liquid of equal weight to the object
What happens if an object has a low density?
More of the object will remain above the surface
What happens to an object denser than the surrounding liquid?
It cannot displace enough liquid equal to its own weight so it sinks
The size of the upthrust is equal to the weight of the liquiddisplaced (by the object) - no matter how dense an object is
