Bissoy.com
Doctors Medicines MCQs Q&A

A backward dragging force that acts tangentially on the layers of the fluid in motion and tends to destroy its motion is called-

A backward dragging force that acts tangentially on the layers of the fluid in motion and tends to destroy its motion is called- Correct Answer Viscous Drag

option(1)

CONCEPT:

  • Viscosity: The property of fluid by virtue of which an internal force of friction comes into play when a fluid is in motion and that opposes the relative motion between its different layers is called viscosity.

EXPLANATION:

  • A backward dragging force is called viscous drag and it acts tangentially on the layers of the fluid in motion and tends to destroy its motion.
  • Viscosity is like friction which converts kinetic energy into heat energy.
  • Viscosity is considered an internal resistance that comes into play when fluid is in motion.

  • The coefficient of Viscosity is defined as the tangential viscous force required to maintain the unit velocity gradient between its two parallel layers each of unit area 
  • Kinetic Energy is the type of energy that acts when the body is in motion.
  • Example of Viscosity 
    1. When we swim in a pool of water, we experience some resistance to our motion. This is on account of the viscous forces of water. 
    2. The cloud particle falls down very slowly on account of the viscosity of air and hence seen floating in the sky.

Related Questions

A ring of radius 7cm is rotating about the central axis perpendicular to its plane. A force acts on it, tangentially, such that it does a work of 10J in a complete rotation. Find the value of that force. `
A disc of radius 10cm is rotating about the central axis perpendicular to its plane. A force of 5N acts on it tangentially. The disc was initially at rest. Calculate the value of power supplied by the force when the disc has rotated by 30°.The mass of the disc is 2kg.
Which of the following statements of D’Alembert’s principle are correct? 1. The net external force F actually acting on the body and the inertia force F1 together keep the body in a state of fictitious equilibrium. 2. The equation of motion may be written as F + (-ma) = 0 and the fictitious force (-ma) is called an inertia force. 3. It tends to give solution of a static problem an appearance akin to that of a dynamic problem.
Bernoulli's equation for fluid flow is derived following certain assumptions. Out of the assumptions listed below, which set of assumptions is used in derivation of Bernoulli's equation?
1. Fluid flow is frictionless & irrotational
2. Fluid flow is steady
3. Fluid flow is uniform & turbulent
4. Fluid is compressible
5. Fluid is incompressible
Which of the following statements is/are CORRECT regarding the flow of fluid? a) All fluid layers are parallel to each other in case of turbulent flow. b) The Reynold’s number is less than 2000 for turbulent flow and greater than 4000 for laminar flow. c) Two fluid layers don’t cross each other in case of laminar flow
Consider the following types of motion.  A. Periodic Motion B. Straight Line Motion C. Rotational Motion D. Circular Motion The motion of a pendulum can be categorised in which of the following types of motion?
Statement 1: The stream of water flowing at high speed from a garden hose pipe tends to spread like a fountain when held vertically up, but tends to narrow down when held vertically down. Statement 2: In any steady flow of an incompressible fluid, the volume flow rate of the fluid remains constant.
A wooden block of mass m1 kg accelerates at 10 ms-2 when a force of 5 N acts on it. Another block of mass m2 kg accelerates at 20 ms-2 when the same force acts on it. If both the blocks are tied together and the same force acts on their combination, the acceleration will be about:
A wooden block of mass m1 kg accelerates at m/s when a force of 5 N acts on it. Another block of mass m2 kg accelerates at 20 m/s when the same force acts on it. If both the blocks are tied together and the same force acts on their combination, the acceleration will be about
When a body is subjected to two equal and opposite forces, acting tangentially across the resisting section, as a result of which the body tends to shear off across the section, the stress and strain induced is