Forces may be of 2 types: Contact forces and forces that can act at a distance from the object. Of the forces discussed below, frictional force, viscous drag and upthrust are examples of contact forces while gravitational force and electric force can act on the mass or charge without being in contact with them.

Friction is a force caused by two things rubbing together. Air resistance and water resistance are kinds of friction. Upwards forces from water or air are called upthrust. Things float in water because of upthrust.

The force of upthrust equals the weight of fluid displaced. Viscous forces are caused by relative motion between the body and a fluid. You can call it viscous drag. The force is proportional to the viscosity of the fluid and it also depends on the speed and cross-sectional area of the body moving through the fluid.

As nouns the difference between upthrust and drag is that upthrust is an upward thrust while drag is (uncountable) resistance of the air (or some other fluid) to something moving through it or drag can be (uncountable|slang) women’s clothing worn by men for the purpose of entertainment.

Upthrust and drag of a falling object in a fluid are in the same direction (upwards). Upthrust equals the weight of fluid displaced. For drag, do you mean viscous drag? It is caused by relative motion between the body and fluid, which is proportional to viscosity of fluid. An example is air resistance.

As discussed, the buoyant force is the upward force exerted on an object that is wholly or partly immersed in a fluid. This upward force is also called as Upthrust. It is due to the buoyant force that a body submerged partially or wholly in a fluid appears to lose its weight i.e. appears to be lighter.

Upthrust is caused by a pressure that is larger on the bottom of an object than it is on the top of an object submerged in a liquid. This is why objects appear to weigh less when immersed in a liquid. If the upthrust is greater than the weight of the object, the object will rise up through the liquid.

Upthrust – is a force that pushes things up. Solid things, like your chair, give you upthrust. The upwards force from the ground stops you from sinking into the Earth – this upwards force is called upthrust. Water resistance – is a force that tries to slow things down that are moving through water.

buoyant force