Chapter - 2

Pages - 24-25

#Physics

• Purpose : The Distance Time Graph Is Used To Represent Speed In A Graphical Way, In The Sense It Is Used To Represent The Amount Of Distance Covered In A Particular Time

• Model Of A Distance-Time Graph

As You Can See This Is A Model Of Distance- Time Graph, Bottom Of The Graph Is Time, At The Side Of The Graph Is The Distance Of An Object

• Question

1. How far did she travel?

2. What was her average speed in km/h?

3. How many stops did she make?

4. The rules said she had to stop for half an hour for food. When did she take her break?

5. Later she stopped to help an injured runner. When did this happen?

6. What would her average speed have been if she had not stopped at all?

7. What was her hig

   hest speed and over what section did this happen?

• Answers

  • 40 Km

  • 5 Km/H

  • 2

  • 6 Pm To 7 Pm

  • 5 Pm

  • ?

  • 10 Km/H, From 3 Pm To 5 Pm

    
    

• Acceleration

  • Acceleration -: Acceleration Is The Change In Speed In The Matter Of Time, Acceleration Normally Is Known As The Increasing Speed Of An Object By Time

  • Deacceleration -: Deacceleration Talks About The Decrease In Time Speed By The Given Amount Of Time

  • Formula: Change In Speed/Time

• Scalar And Vector

  • Scalar Quantity Is About Objects With Speed But No Direction, Example : Temperature

  • Vector Quantity Has Both Of Them Direction And Speed , Example : Velocity