College Physics

1st Edition
Paul Peter Urone + 1 other
Publisher: OpenStax College
ISBN: 9781938168000



College Physics

1st Edition
Paul Peter Urone + 1 other
Publisher: OpenStax College
ISBN: 9781938168000
Chapter 5, Problem 6CQ
Textbook Problem

Two expressions were used for the drag force experienced by a moving object a liquid. One depended upon the speed, while the other was proportional to the square of the speed. In which types of motion would each of these expressions be more applicable than the other one?

To determine

There are two expressions for drag force, in which type of fluid motion each of these expressions be more applicable than the other one?

Explanation of Solution

Drag force:

drag force is much similar to force of friction, it always oppose the motion of the object, and it acts on a body when body travels in a fluid (gas or liquid).

There are two expressions for the drag force-

  1. When an object is large, move with a high velocity, and travels in air or rarer medium than air, than the drag force is given by the formula
  2.   FD=12CρAv2


      C is drag coefficient

      ρ is density of fluid

      A is surface area of the object

      v is the velocity of the objssssect

  3. When the object is small, moves slowly and travels in denser medium than air, the expression of drag force is given by stokes formula
  4.  &emsp

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Chapter 5 Solutions

College Physics
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