Because some objects are heaver than others.
Materials float or sink depending on their density. If an object is less dense than the liquid it is placed in, it will float. If it is more dense, it will sink. The buoyant force acting on the object helps determine whether it will float or sink.
On some liquids it will float, on others it will not.
when a object float it has density
The buoyancy of an object determines if it will float or sink. Objects with a density less than that of the fluid they are placed in will float, while objects with greater density will sink. Additionally, the shape and size of an object can also affect whether it floats or sinks.
Whether an object floats or sinks is a function of its relative density, to the medium in which it is placed. If the object is less dense, it floats, If it is more dense, it sinks. Density = Mass per unit Volume
It's far from clear what the actual question is. Some objects float in both salt and fresh water, some objects float in neither, and some objects float in one but not the other. Any object that floats in fresh water will float in salt water, but the reverse is not true.
Since density is proportional to it's mass and the ability to float is inversely proportional to it's volume, an object that's heavy will sink and an object that's light should float. An object that has some surface volume should float, while an object that has little surface volume should sink.
Because lighter stuff float but Heaver stuff don't
Some things float on water because they are less dense than water, creating buoyancy that allows them to stay afloat. Other things sink in water because they are denser than water, causing them to displace water and sink. Factors like shape, size, and weight can also affect whether something will float or sink in water.
An object will float if it has less density than the fluid it is placed in.For example, in the specific case of water, some objects that will float on it is anything made from most woods and most plastics.
Yes, adding salt to water increases its density, which can make some objects that would normally sink, like eggs, float. By altering the density of the water, the buoyant force exerted on the object can be increased to make it float.
Objects float in fluids when the fluid exerts an upward force (buoyant force) equal to the object's weight. This happens when the object is less dense than the fluid. Objects that are denser than the fluid will sink because the buoyant force is less than the object's weight.