Page 15 - Science E-Book Prep.3 2024-2025 1st term unit1_Neat

Science Department
Prep.3

P.O.C Positive acceleration Negative acceleration

It is an acceleration by It is an acceleration by which an
which an object moves in a object movesin a straight line when
straight line when its speed its speed decreases by equal values
increases byequal values through equal periods of time
through equal periods of
time

initial speed < final speed initial speed > final speed

It means: It means:

- Speed of moving - Speed of moving object
object increases with decreases with time.
time.
- Acceleration decreases (-ve
- Acceleration increases acceleration) (deceleration)
(+ve acceleration)
An object moves at a
An object moves at a negative acceleration
positive acceleration equals -2 m/sec2
equals 2 m/sec2 This This means that the object moves
means that the object in
moves in a straight line a straight line and its speed
and its speed increases decreases by 2m/sec. each one
by 2 m/sec. second.
each one second

First Term 14