Question

When an object is submerged in a fluid at rest the fluid exerts a force normal to the object surface why?

Answer 1

As the particles of a fluid bump into an object in the fluid, they

apply forces to the object. The forces, acting over the object’s surface,

exert pressure on the object. When the pressure in a fluid increases, the

particles bump together more frequently. This increases the pressure

on objects in the fluid.

The pressure a fluid exerts on an object in the fluid is applied in

all directions. That is because the particles that make up the fluid can

move in any direction. These particles exert forces as they bump into objects under fluid.

Hope this will help you.....