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FREE FALL
Free fall is the motion of an
object under the effect of
gravitational force only.
Free fall
Motion of bungee jumper Motion of skydivers
Important note
• Free fall does not mean that the object
is falling down only.
• Objects thrown upward or downward and
tho...
Falling objects & air resistance
More air resistance on without
crumpled-up piece of paper
Less air resistance on
crumpled...
Falling objects & air resistance
In vacuum both feather and apple
falls at the same rate.
Reason:
In vacuum there is no ai...
Acceleration due to gravity
0 s, v1 = 0 m/s
1 s, v2 = 9.8 m/s
2 s, v3 = 19.6 m/s
3 s, v4 = 29.4 m/s
4 s, v5 = 39.2 m/s
• D...
Sign convention
Position Velocity Acceleration
y > 0
y < 0
0 0
y y y y
v > 0 v < 0
a = -g
y
Equations of motion for free fall
Kinematical equations of motion is also applicable for free fall
because, free fall is a...
Position-time graph for free fall
Time (s) Position (m)
0 0
1 -4.9
2 -19.6
3 -44.1
4 -78.4
5 -122.5
1 2 3 4 5 6
t0
-40
-20...
Velocity-time graph for free fall
Time (s) Velocity (m/s)
0 0
1 -9.8
2 -19.6
3 -29.4
4 -39.2
5 -49
1 2 3 4 5 6
t0
-20
-10
...
Acceleration-time graph for free fall
Time (s)
Acceleration
(m/s 𝟐
)
0 -9.8
1 -9.8
2 -9.8
3 -9.8
4 -9.8
5 -9.8
1 2 3 4 5 6...
Thank
you
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This presentation covers vertical motion under gravity, effect of air resistance on free fall & graphs of free fall. I hope this PPT will be helpful for instructors as well as students.

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Free fall

  1. 1. FREE FALL
  2. 2. Free fall is the motion of an object under the effect of gravitational force only. Free fall
  3. 3. Motion of bungee jumper Motion of skydivers
  4. 4. Important 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.
  5. 5. Falling objects & air resistance More air resistance on without crumpled-up piece of paper Less air resistance on crumpled-up piece of paper
  6. 6. 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.
  7. 7. Acceleration due to gravity 0 s, v1 = 0 m/s 1 s, v2 = 9.8 m/s 2 s, v3 = 19.6 m/s 3 s, v4 = 29.4 m/s 4 s, v5 = 39.2 m/s • 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. 𝑔 = 9.8 m/s2
  8. 8. Sign convention Position Velocity Acceleration y > 0 y < 0 0 0 y y y y v > 0 v < 0 a = -g y
  9. 9. 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. HORIZONTAL MOTION FREE FALL vf = vi + at vf = vi − 𝑔t xf − xi = vit + 1 2 at2 yf − yi = vit − 1 2 𝑔t2 vf 2 = vi 2 + 2a(xf − xi) vf 2 = vi 2 − 2𝑔(yf − yi)
  10. 10. Position-time graph for free fall Time (s) Position (m) 0 0 1 -4.9 2 -19.6 3 -44.1 4 -78.4 5 -122.5 1 2 3 4 5 6 t0 -40 -20 -60 y -100 -80 -120
  11. 11. Velocity-time graph for free fall Time (s) Velocity (m/s) 0 0 1 -9.8 2 -19.6 3 -29.4 4 -39.2 5 -49 1 2 3 4 5 6 t0 -20 -10 -30 v -50 -40 -60
  12. 12. Acceleration-time graph for free fall Time (s) Acceleration (m/s 𝟐 ) 0 -9.8 1 -9.8 2 -9.8 3 -9.8 4 -9.8 5 -9.8 1 2 3 4 5 6 t0 -4 -2 a -6 -8 -10 -12
  13. 13. Thank you
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This presentation covers vertical motion under gravity, effect of air resistance on free fall & graphs of free fall. I hope this PPT will be helpful for instructors as well as students.

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