• Skip to main content
  • Skip to secondary menu
  • Skip to primary sidebar

Class Notes

Free Education for All

  • Class 1-5
  • Class 6
  • Class 7
  • Class 8
  • Class 9
  • Class 10
  • Class 11
  • Class 12
  • NCERT Solutions
    • NCERT Books
You are here: Home / Class 9 / Motion / Motion

Motion

Last Updated on July 19, 2020 By Mrs Shilpi Nagpal Leave a Comment

Question 1 Define motion?

Question 2 Define distance?

Question 3 Define displacement?

Question 4 What is a scalar quantity?

Question 5 What is a vector quantity?

Question 6 Define uniform motion?

Question 7 Define non-uniform motion?

Question 8 A body is moving along a circular path of radius R.What will be the distance travelled and displacement of the body?

Question 9 Under what conditions can a body travel a certain its resultant displacement be zero?

Question 10 A body travels a distance of 3 km towards East,then 4km towards North and finally 9 km towards East:

a)What is the total distance travelled.

b)What is the resultant displacement.

Motion

A body is said to be in motion when its position changes continuously with respect to a stationary object.

Tree,House,school,telephone are stationary(fixed at a place)

Man,animal,vehicles,birds,fishes etc are not stationary.

Distance and displacement

Distance is the actual length of the path covered by a moving body irrespective of the direction in which it travels.It has only magnitude.It can never be zero.
For Ex:50km

Displacement is the shortest distance between initial and final position of body along with direction.It has magnitude as well direction.It can be zero if initial and final position is same. For Example: 50 Km towards east

A physical quantity which has only magnitude and no direction is called as scalar quantity.

A physical quantity which has magnitude as well as direction is called vector quantity.
If we take a round trip and reaches back at same point then distance will be 2 π r and displacement will be zero.

Whenever a body travels along a zig zag path,the final displacement is obtained by joining the starting point and finishing point of body by a straight line.

Uniform and non-uniform Motion

Uniform Motion
A body has uniform motion if it travels equal distance in equal interval of time,no matter how small these time intervals may be.

uniform motion

Distance-time graph for uniform motion is a straight line.

Time(min) 10 20 30 40 50 60 70
Distance(km) 10 20 30 40 50 60 70

Non-Uniform Motion

A body has non-uniform motion if it travels unequal distance in equal intervals of time.

Distance time graph will be a curved line.

non uniform motion

Time(min) 1 2 3 4 5 6 7
Distance(km) 3 3.9 4.6 5.3 6.1 6.4 6.9

Filed Under: Motion, Class 9 Tagged With: displacement, distance, motion, non-uniform motion, scalar quantity, uniform motion, vector quantity

About Mrs Shilpi Nagpal

Author of this website, Mrs Shilpi Nagpal is MSc (Hons, Chemistry) and BSc (Hons, Chemistry) from Delhi University, B.Ed (I. P. University) and has many years of experience in teaching. She has started this educational website with the mindset of spreading Free Education to everyone.

Reader Interactions

Leave a Reply Cancel reply

Your email address will not be published. Required fields are marked *

Primary Sidebar

Recent Posts

  • Chapter 10 The Beggar
  • Chapter 8 A House is Not a Home
  • Chapter 7 The Last Leaf
  • Chapter 6 Weathering the Storm in Ersama
  • Chapter 5 The Happy Prince
  • Chapter 4 In the Kingdom of Fools
  • Email
  • Facebook
  • Pinterest
  • RSS
  • Twitter

Copyright © 2022 · About Us · Contact Us · Privacy Policy