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Does the mass of an object affect its speed falling to the ground?

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Judith Pascual

on 12 December 2013

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Transcript of Does the mass of an object affect its speed falling to the ground?

Does the mass of an object affect its speed falling to the ground?
Judith Pascual
Rachel Carson Elementary School
Ms. Chudy

Statement of Problem
Does the mass of a falling object affect its speed falling to the ground?
Project Overview
I chose this project to learn more about Earth's gravitational pull and if mass affects falling speed. Readers will expect to see the importance mass has on gravity. This project can impact society by maybe providing more information on topics that most people cannot understand well or have to answers to.
Review of literature
Gravity pullls objects towards the ground. If gravity didn't exist, then everything would be floating around. But the mass of the falling objects is important behind the question if their mass affects their falling speed rate. The mass of an object affects how much gravity acts upon it. The speed can be affected by air drag, a force that acts upon a falling object . But air drag doesn't have a big impact on the speed. Either way the different masses have a bigger impact. Every falling object has the acceleration of 9/8m/s/s, no matter their mass or shape. Without gravity, none of these forces would exist.
Image by goodtextures: http://fav.me/d2he3r8
Independent Variable: Mass
Dependent Variable: Speed
Controlled Variable: Same material
If I drop a heavy object then it will fall quickly to the ground because if there's more mass then there will be more gravitational pull on the object
Materials: 1 Timer, 1 meter stick, 1 balance scale and 4 objects of the same shape and height.
1. Gather all the materials you need for the experiment
2 . Record the mass of each of the four objects and make sure they all have different masses.
3. Choose 1 object; it does not matter if it is the object with the highest or lowest amount of mass.
4. Put object #1 one meter (100 cm) in the air
Proecdure ( Continued)
5. Let go of object #1 and time how many seconds it takes object #1 to fall and hit the ground.
6.Record the seconds it took object #1 to hit the ground.
7. Repeat steps 4-6 with object #1 until you have done three trials, including the 1st trial you have done and finished.
8. Choose which object you will test next and repeat steps 4-6; make sure you have 3 trials when you finish.
9. Repeat steps 4-6 with the remaining 2 objects.
5 Quantitative observations
The speed of every ball is very different.
Only 2 balls had the same average speed.
Each ball took less than a second to reach the ground.
Only 2 trials had the same average speed.
Ball #1 took between 30-55 milliseconds to hit the ground.

5 Qualitative observations
The objects were yellow.
The objects were spheres.
The objects smelled like Play Doh.
the objects were very soft.
Ball #3 was the smallest.
Ball#1 Ball #2 Ball #3 Ball #4
Ball #1
Ball #2
5.1g 4.6g 4g 3.9g
My results showed that subject#1 took 55 milliseconds top hit the ground, subject#2 took 30 milliseconds to hit the ground, and subjects#3 and #4 both took 52 milliseconds to hit the ground. My data proves that my hypothesis was correct. My hypothesis stated that if a heavy object was dropped then it would fall faster to the ground because if there’s more mass in an object then there would be more gravitational pull on the object. My hypothesis was supported because my data showed that the heavy objects fell faster than lighter objects.
3 sources of error
not so much spherical shape.
Not the same height.
Miss weighed objects.

Works cited
Coffey, Jerry, (2010) What is Air Resistance? Retrieved from http://www.universetoday.com/73315/what-is-air-resistance/.
Creighton, Jolene, (2013) Life without Gravity Retrieved from http://www.fromquarkstoquarsars.com/life-without-gravity.
Free fall and Air Resistance (2013) In the Physics classroom Retrieved from http://www.physicsclassroom.com/class/newtlaws/U2L3e.cfm.
Terminal Velocity (2013) In Encyclopedia Britannica Online Retrieved from http://www.britannica.com/EBcheckedtopic/58801/terminal-velocity.
Newton’s 1st Law of Motion (2013) Retrieved from http://www.physicsclassroom.com/newtlaws/u2la.cfm

Data table
Ball #1
Ball #2
Ball #3
Ball #4
Trial #1
Trial #2
Trial #3
0.32 s
0.63 s
0.57 s
0.60 s
0.52 s
0.56 s
0.47 s
0.43 s
0.47 s
0.50 s
0.51 s
0.53 s
0.44 cm/s
0.56 cm/s
0.52 cm/s
0.52 cm/s
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