Physics - Fluid Question with Solution | TestHub
A spherical object is falling under gravity through a viscous fluid. The sphere attains the terminal velocity when
Options:
Answer:
Solution:
When a spherical object falls under gravity through a viscous fluid, three forces act on it:
1. Force due to gravity (weight) acting vertically downwards.
2. Buoyant force acting vertically upwards.
3. Viscous drag force acting vertically upwards (opposite to the direction of motion).
The object attains terminal velocity when its acceleration becomes zero, meaning the net force acting on it is zero.
For the net force to be zero, the total upward force must be equal to the total downward force.
Therefore, buoyant force plus viscous force becomes equal to the force due to gravity.
Answer: buoyant force plus viscous force becomes equal to force due to gravity.
