In this post, I am sharing FSC 1st Year Physics Chapter 5 Notes PDF for the students of Intermediate Part 1. This chapter’s name is Circular Motion. Students can download 11th class chapter 5 Circular Motion Notes PDF in there laptop or mobile. These 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. Here are the complete FSC 1st Year Physics Notes PDF chapterwise.

**Table of Contents**show

## FSC Part 1 Physics Chapter 5 Circular Motion Notes PDF Download

### What is circular motion?

When a body is moving in circle then its motion said to be circular or angular motion.

Example;

moon revolve around the earth in circular path

electron revolve around the nucleus in nealy circular orbit.

### What is Radian?

Radian can be defined as “angle made by an arc at the center of a circle, whose length equal to radius of the circle.”

### Define degree.

If the circumference of a circle divided into 360 equal parts, the angle made by each part at the center of the circle, called one degree.

### Prove that s = rq

If an arc of length s of a circle of radius r subtends an angle q at the center of the circle then

q = arc length / radius = s/r rad

or s = rq

Arc length is always equal to the product of radius and the angle made by arc at the center.

### What is the relation between radian and degree? Or show that 1 rad = 57.3^{0}.

In one revolution (rev) there are 360^{0} or 2p rad angle are present, so

1rev = 2p rad = 360^{0}

2p rad = 360^{0} rad = 360^{0}/2p = 180^{0}/p = 180^{0}/3.14

1 rad = 57.3

### Define angular velocity.

The rate of change of angular displacement of a body moving in a circular path called angular velocity.

if a body move from point P_{1 }to P_{2 } and covers angular displacement Aq in time At then average angular velocity given by.

### Related links:

FSC 1st Year Physics Chapter 1 Notes pdf download

1st year physics chapter 2 notes pdf download

11th class physics chapter 3 notes pdf download

Fsc part 1 physics chapter 4 notes pdf download