Page 8 - Science E-Book Prep.3 2024-2025 1st term unit1_Neat

Science Department
Prep.3

Relative speed: It's the speed of moving object relative to an
observer.

It depends on the position of observer.

Observer at rest In the same direction In opposite direction

The relative speed The relative speed = The relative speed =
= The real(actual) The real speed of the The real speed of the
speed of the object object
-The observer's speed + The observer's speed
"The relative
speed is equalto The relative speed is The relative speed is
the real speed more thanthe real less than
speed of any of them the real speed of any of
them

Give Reasons Bec. Traffic affects car's speed
- It's difficult practically to make
uniform speed. Bec. Speed is inversely
proportionalwith the time
- The speed of moving body V = distance / Time
increases by decreasing the time
needed to cover a certain
displacement.

First Term 8