1. Free-Fall

2. Free Fall Experiment Conclusion Questions
6/10/2018 6:37 AM
Free Fall Experiment Conclusion Questions
Did the ball travel at the same velocity from the moment it dropped until it hits the ground? Describe how you know.
Do you think that the ball’s displacement increased or decreased as it fell toward the ground? Describe how you know.
Does the mass of the object affect the rate at which it accelerates? Explain how you know.
Does the height of the drop affect the rate at which it accelerates? Explain how you know.
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3. Free-Fall
Free Fall
When an object is free of all restraints it falls under the influence of gravity alone
(Restraints include wind resistance, friction, etc…)

4. Now that we know the acceleration due to gravity is a constant value of 9.8 m/s2…. When dropped from the same height, which will hit the ground first? The basketball or the ping pong ball?

5. Motion of an object in free fall
What factors affected the rate of acceleration?
What happens to the displacement during each second that it is falling?
What happens to the velocity each second that it is falling?

6. Free-Fall
Free Fall
When an object is free of all restraints it falls under the influence of gravity alone
(Restraints include wind resistance, friction, etc…)
The only acceleration in free-fall is due to gravity
During each second of free-fall, an object gains an additional 9.8 m/s.
The acceleration of gravity is 9.8 m/s/s or 9.8 m/s2

7. Falling objects Covers more and more distance each second
Falling from rest (stationary):
Covers more and more distance each second
Velocity starts at zero and increases velocity downwards
Velocity increases by 9.8 m/s each second
0 m/s
0 m
4.9 m
9.8 m/s
19.6 m
19.6 m/s
44.1 m
29.4 m/s

8. Constant Acceleration
9.8 m/s2
Falling ball accelerates downward steadily
Acceleration is constant and downward
Velocity increases in the downward direction
Gravity!
4.9 m
0 m
19.6 m
44.1 m
0 m/s
9.8 m/s
19.6 m/s
29.4 m/s

9. Free-Fall Example Time of Fall (s) Instantaneous Speed (m/s) 1 9.8 21
9.8 2
19.6 3
29.4 4
39.2 5
49.0 . t
9.8 t
v = velocity
g = gravity
9.8 m/s2
t = time

10. Objects fall toward Earth because of a force called gravity
Objects fall toward Earth because of a force called gravity. Acceleration due to gravity (g) is: m/s2
If a bowling ball dropped from the roof, after the 1st second, it would be traveling 9.8 m/s.
A second later its velocity is 19.6 m/s.
After falling for 10 seconds, its velocity is 98 m/s or about 219 miles per hour!
1 second 9.8 m/s
2 seconds m/s
10 seconds 98 m/s
0 m/s

11. Free Fall in a Vacuum https://www.youtube.com/watch?v=E43-CfukEgs
An apple and a feather are released simultaneously through a trap door into a large vacuum chamber.
Because the chamber has a partial vacuum, there is still some air resistance.
How can you tell??

12. What goes up……Must come down!
V=______
V=______
Vi= m/s
VF=______
a =______
a =______

13. Free-Fall on the Moon