Home 1st Year Physics Notes FSC 1st Year Physics Chapter 6 Short Questions Notes PDF

# FSC 1st Year Physics Chapter 6 Short Questions Notes PDF

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In this post, I am sharing the FSC 1st Year Physics Chapter 6 Short Questions with Answers Notes in PDF format for the students of Class 11. This is chapter number 6 from the 11th physics textbook and its name is Fluid Dynamics. Students can download FSC 1st Year Physics Chapter 6 Sort Questions Notes PDF on their laptop or mobile to read offline. These 1st Year’s Physics Notes are for all the boards working under Punjab Board like Gujranwala Board, Lahore Board, Faisalabad Board, Multan Board, Rawalpindi Board, Sargodha Board, DG Kahn Board, and Sahiwal Board. You can also download the complete FSC 1st Year Physics Notes PDF of all chapters from ilmihub.com.

## Class 11 Physics Chapter 6 Short Questions with Answers

### What is meant by drag force? What are the factors upon which downforce acting upon a small sphere of radius r moving down through a liquid depends?

An object moving through a fluid experience a retarding force called drag force.

According to the stroke law, the drag force is

F = 6pnrv

It depends upon the velocity v of the spherical object, radius r of the spherical object and co-efficient of viscosity of the fluid

### Why do drag droplets appear to be suspended in the air?

The terminal velocity of an object moving in a fluid is
v = mg/6pnrv

The drag force upon the velocity v of the spherical object, radius r of the spherical object and coefficient of viscosity n of the fluid.

### Explain the difference between laminar and turbulent flow.

Laminar flow:

The flow is said to be a steam line or laminar, if every particle that passes a particular point, moves along exactly the same path, as followed by particles that passed that point earlier. Each particle of the fluid moves along a smooth path called a steam line.

Turbulent flow:

The unsteady or irregular flow of the fluid is called turbulent flow. In case the velocity of the fluid.

changes abruptly and the exact path of the particles of fluid cannot be predicted,

### define drag force.

An object moving through a fluid experience a retarding force the force called drag force or fluid friction. The drag force increases as the speed of the object increases.

Mathematically

Drag force is

F = 6pnrv