Comments on: Activity in Physics, Gravity, STI Dagupan

By: Nahum Quiros & Tim Alec Calicdan

Nahum Quiros & Tim Alec Calicdan — Mon, 26 Jul 2010 03:23:41 +0000

If a book and a group of three books is dropped at the same time,they will reach the ground at the same time. This is due to the fact that all objects regardless of their weight will fall at an initial acceleration of 9.8 m/s2. This is however, true only if the objects (such as books) will not generate centrifugal force (such as spherical objects). There could also be a slight difference if there is an interaction of external factors such as air friction or wind.

By: Fatima Turingan and Lady Madell Puquiz

Fatima Turingan and Lady Madell Puquiz — Thu, 22 Jul 2010 01:03:44 +0000

As we tried and done the required activity assigned to us, we’ve seen and proven that the three books where we put in our right hand and the only book in our left hand had fall and reach the ground at the same rate of acceleration. They reach the ground at the same time as we dropped it. They’re mass won’t be the same but we think it can’t affect gravity or the gravitational pull.

By: John Parayno and Khevien Luarca

John Parayno and Khevien Luarca — Tue, 20 Jul 2010 06:21:50 +0000

Answer:
the solo book and the three books when dropped at the same time, both set of books will reach the ground simultaneously, it’s because the mass of the two objects won’t affect the gravitational pull and their acceleration rate. That’s true if there’s no opposing forces like air resistance(air friction) or any object interaction with one of the two sets of books. Regarding the same acceleration rate, it’s only true with the shape of the book but not with other shape of objects.

– ミチセトカイス

By: Paul jeffrey Panis and Rogelio Moyano

Paul jeffrey Panis and Rogelio Moyano — Tue, 20 Jul 2010 05:29:06 +0000

We conclude that the two books and one book both fall down at the same time cause of high gravity.If we drop down the books at the higher place maybe the two books will go first cause of its weight and the one book will fall down second because of its light weight the air may decrease their acceleration to fall down.

By: nik charles gutierrez

nik charles gutierrez — Sat, 17 Jul 2010 11:18:17 +0000

if one of the objects or books would poss three times the force compare to only one, the force of three books will become six times larger than only one book. now we can understand why all bodies fall, with the exact same velocity.a book of three times the weight will be attracted with three times the force but it will also contain three times the mass. these influences will neutralize each other.

By: Group 3: by: Mark Daniel R. Dimalanta and Bobby S. Castillo

Group 3: by: Mark Daniel R. Dimalanta and Bobby S. Castillo — Wed, 14 Jul 2010 12:02:45 +0000

Revision: Sir we’ve just included the air resistance which may affect the two falling objects not to hit the ground at the same time . but our answer is even though objects have not the same mass, the mass will not have an impact on the speed of falling. Like we did in our activity the books fall at the same time, This is because the acceleration due to gravity,is a constant for all objects, no matter what their mass.

“http://macrotechdan.multiply.com”

By: Group 3: by: Mark Daniel R. Dimalanta and Bobby S. Castillo

Group 3: by: Mark Daniel R. Dimalanta and Bobby S. Castillo — Wed, 14 Jul 2010 11:58:36 +0000

Sir we’ve just included the air resistance which may affect the two falling objects not to hit the ground at the same time . but our answer is even though objects have the same mass, the mass will not have an impact on the speed of falling. Like we did in our activity the books fall at the same time, This is because the acceleration due to gravity,is a constant for all objects, no matter what their mass.
“http://macrotechdan.multiply.com”

By: Gener

Gener — Wed, 14 Jul 2010 08:12:19 +0000

By Marinel Chan @ Conrado Alcantara

answer:
The books will fall at the same time. Because both books have the same gravitionalful. Because gravity is not affected by the mass or weigth of objects. Because in the formula h=1/2gt^2, where h is the height, g is the gravitional constant, and t is the time

By: Gener

Gener — Tue, 13 Jul 2010 14:57:53 +0000

@Group 3 great effort and time done here with your activity… I require a two person per group not four… and at the same time I need original answers as much as possible please rephrase your answer and divide your team into two.

By: Group 3: by: Mark Daniel R. Dimalanta,Bobby S. Castillo,Rhannel Ubando

Group 3: by: Mark Daniel R. Dimalanta,Bobby S. Castillo,Rhannel Ubando — Tue, 13 Jul 2010 13:52:13 +0000

answer: Both Books will reach the ground at the same time.

Justification:

The law behind that is the following. The mass of an object does not have any influence on this speed when falling. This is the law for vertically falling objects.

h = 1/2gt^2

where h = height in meters
g = gravity constant in m/s^2 (9.8 on earth)
t = time in seconds

The concept behind this is that even though objects have the same mass, the mass will not have an impact on the speed of falling.

You can see this in the formula, there is no mass variable included.

But another thing is the effect of air resistance. It may affect two objects with the same weight to fall at the same time.To illustrate air resistance, take two sheets of paper, crumple one up into a ball, and drop them together. They have the same weight , but the flat sheet has more area “fronting the wind” causing the two sheets will not hit the ground at the same time.

definition:

Air resistance is the enemy common to all runners and cyclists. Air produces frictional forces which tend to reduce the speed of anyone moving through it. About eight per cent of a runner’s energy is expended in overcoming
air resistance, but up to 80 per cent of that energy can be saved by drafting (running directly behind another runner).

By: Gener

Gener — Sun, 11 Jul 2010 12:10:14 +0000

Thanks Terence for the answer and answering first.

By: Terence Pestin & Kelvin Erickson Garcia

Terence Pestin & Kelvin Erickson Garcia — Sun, 11 Jul 2010 07:25:55 +0000

The three books will fall first if there is an air friction. But, if there’s no air friction, both of them will reach the ground at the same time.