What is the frictional force exerted by fluids known as?
Show answer & explanation
Correct answer: B
Explanation
Correct Answer: Option 2: Drag
Explanation:
The frictional force exerted by fluids (liquids and gases) on objects moving in them is called drag or 'fluid friction'. When an object moves through a fluid, it has to overcome this resistive force. The magnitude of drag depends on the object's speed, its shape, and the nature of the fluid.
Additional Facts:
Streamlining: To reduce drag, the bodies of airplanes, birds, and fish are given a specific 'streamlined' shape.
Viscosity: The thicker the fluid (such as honey), the greater the drag force.
Lift: This is the force that acts perpendicular (upward) to the drag and helps the airplane fly.
Possible Questions for the Upcoming Exam:
Why are airplanes and ships designed to be 'streamlined'?
(Answer: To reduce fluid friction or drag).
On what factors does fluid friction depend?
(Answer: The shape of the object, its speed, and the nature of the fluid).
In which medium will an object experience more drag when moving – water or air?
(Answer: In water, because it is denser than air).