Kaymito Leaves Decoction as Antiseptic Mouthwash

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San Sebastian College – Recoletos
High School Department
Manila

Principle of Gravitational Force

An Investigatory Project Submitted to
Mrs. Elizabeth S. Nicolas
In Partial Fulfilment of the Requirements in
Science IV (PHYSICS)

Name: Mark Joseph Delfin
Patricia Blessy Gonzales
Reymon Musa
John Michael Ortiz

Date: March 4, 2013

i
ABSTRACT

Delfin M.J. (2013) The Principle of The Gravitational Force
Gonzales P.B.
Musa R.M.

The objective is to explain the principle of gravity about the water-cardboard experiment which is influenced by a lot of environmental factors by creating an air pressure and explore various differentials using a varying material. For the properties of the fluids, water is incompressible. Meaning, even if additional pressure was exerted, no change in volume will be observed. On the other hand, Air is compressible; it can change its volume under pressure, can be either compressed into a lesser volume or can be expanded once the pressure is release.

We tried bending the rules a little with a cup of water that stays inside the glass when held upside down. In order for us to know the first thing that we’ve done is to collect all the materials that we need. Now the materials are gathered, the next thing we did is to fill the glass until it is almost full. Then carefully place the cardboard on top of the glass, holding it in place to ensure that no air bubbles enter the glass. Holding the cardboard flush to the glass, turn the glass completely upside down. Over the sink, another water-safe surface, or outside, remove your hand from the cardboard.

ii
This sometimes requires practice, but the lack of air bubbles will create a pressure difference strong enough to hold the cardboard in place when your hand is removed. Then Repeat steps with different materials such as different pieces of cardboard/index cards or playing card. With that procedure, it does work. Even though the glass of water is upside down, still the water stays in place. With no air inside the glass, the air pressure from outside the glass is greater than the pressure of the water inside the glass so the extra air pressure manages to hold the cardboard in place, keeping the cardboard dry and your water where it should be, inside the glass.

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Table of Contents
Page
Title Page………………………………………………………….………………………………i Abstract…………………………………………………………………………………………...ii Table Of Contents………………………………………………………………………………...iii

Introduction………………………………………………………………………………………1 Statement of the Problem………………………………………………………………………...2 Hypothesis
List of materials……………………………………………………………….…………………3 Design of Experiment………………………………………………………………………...…3-4 Presentation of Data……………………………………………………………………………..5-6 Summary………………………………………………………………………………………....7 Conclusion……………………………………………………………………………………….8 Bibliography……………………………………………………………………………………..9

iii

I. Introduction

Air pressure is the total quantity of force that the surrounding atmosphere is employing to push on a single point. In this experiment we fill the glass to the very top and cap it off with cardboard, removing any air bubbles or air access. This creates a situation where the air pressure outside of the glass is greater than that inside the glass. The force of the outside air pressure is strong enough to hold the cardboard in place once your hand is removed.

At some point the water together with the cardboard will fall and if this happens the primary reason is that there is a slight opening in between the water and the cardboard that causes the water to fall. As the water flows out of the container this causes the air to enter and pushes the water out of the container. For the property of fluids, Gas is compressible and as it enters the container, its volume expands and pushes the water out of the container, the water will stay together with the cardboard if its handled perfectly. The...
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