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1. Shamma Abdulbaset
11HS
FREE FALL

2. DEFINITION
Free fall is the motion of an object under the effect of
gravitational force only

3. NOTE
Free fall does not mean that the object is falling down only.
•Objects thrown upward or downward and those released
from rest are all the examples of free fall.

4. FALLING OBJECTS & AIR RESISTANCE

5. FALLING OBJECTS & AIR RESISTANCE
In vacuum both feather and apple falls at the same rate.
Reason: In vacuum there is no air, it means there is no air
resistance. So surface area and mass makes no difference.

6. ACCELERATION DUE TO GRAVITY
During each second of fall, the speed of a ball changes by 9.8
m/s.
• The change in speed is due to gravity.
•Hence, the acceleration in this case is called acceleration due
to gravity.

7. EQUATIONS OF MOTION FOR FREE FALL
Kinematical equations of motion is also applicable for free fall
because, free fall is an example of uniformly accelerated motion

8. FREE FALL
Top 5 Facts for objects thrown straight up & free fall!
“g” is ALWAYS -9.8 m/s2
If thrown up, the velocity is zero at max height!
Time going up = Time going down
All kinematic equations may be used for vertical projectiles… EXCEPT
V = d/t and
V = (Vf + Vii)/2
Even at max height when final velocity is zero, “g” is still -9.8 m/s2

9. THANK YOU!