Our video showing experiments displaying newtons third law participants are Virginia Garnier 218244034 and Daniel Harmer 211348932

SCRIPT AND REFERENCES

Hey I’m Dan and I’m Virginia.  

 

Today we are looking at the physics involved in newton’s third law which focuses on force, but more specifically the exertion of force on an object and then the reaction of that object, for every action there is an equal and opposite reaction.

 

We have comprised three experiments which will show newton’s third law in full affect these include

 

A hero’s engine

·      Inflation/ release of balloon

·      Rocket launch

 

Before we can get into the experiments you should probably know the safety factors

Firstly, in the last experiment we will be using sodium bicarbonate which is an alkaline substance that is abrasive and amphiprotic, in terms of skin it will act as a chemical exfoliate and will remove the skins acid mantle as it has a pH of 8 when mixed with water thus will dry the skin out and cause damage.

 

All though we are only using small amount in the experiment please wear gloves and protective eyewear.

As well as sodium bicarbonate, we will be using vinegar which is classed as a skin and eye irritant as well as being corrosive, so please ensure you are wearing protective eyewear gloves and a lab coat to protect the rest of your body.

We also have our hair tied back and we are wearing closed toe shoes.

 

 

 

Move on to spinning cup

For this experiment, you will need a bucket, a plastic cup, two plastic straw, some string, water and super glue.

To help explore newton’s third law we have constructed a hero engine, created by hero of Alexandria the invention shows us one way in which an action can lead to an equal an opposite reaction.

 

 

Here we can see the action of the water being forced by gravity to leave the cup in a clockwise direction the water pushes back on the cup in a counter clockwise direction, causing the cup to spin this is the reaction. This is the very principle that enables rockets to work - gas that is forced out of the nozzle pushes back on the rocket, propelling it forward

 

 

 

Newton’s third law is apparent in two ways when looking at balloons. Firstly, the inflation of the balloon and secondly release. For this all you will need is a balloon

Now when you have a balloon and you blow into it to inflate it you are expelling air from your body into the balloon casing. The gas particles will move around vigorously as more and more are added thus the force increasing and in turn the reaction will be the balloon expanding in size.   

When the balloon has been inflated, the gas particles within it will still be moving around very quickly as they are confined in the small space of the balloon. The result of this being the pressure on the inside of the balloon will be greater than that outside of it meaning if we were to release the balloon the air would rush out quickly and expel a force on the balloon which would react and be thrusted forward as a result of the action of air coming out of the balloon quickly.

This can be shown in the real-life scenario of rockets which we will attempt to show you by making our very own rocket. For this you will need an empty soda bottle, bi carb soda, white vinegar, a cork, duct tape, paper towel and 6 pencils.  

When looking at newton’s third law of every action has an equal and opposite reaction rockets are a prime example. As fuel is expelled with force from one end there will be an equal and opposite reaction of the rocket being propelled upwards as the fuel is propelled downwards thus creating enough force to move the rocket. This can be shown here with our homemade rocket as the chemical reaction occurs within the rocket and create pressure, when the pressure becomes greater inside the bottle than outside the fuel will be expelled through the nozzle and will propel the rocket upwards.

 

 

*do rocket experiment*

 

These experiments have shown us the many ways in which newton’s third law is applicable in real life, from blowing up a balloon to rockets launching into space. Physic is part of our everyday lives.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

References

Integrated Teaching and Learning Program, College of Engineering, University of Colorado Boulder. 2018. Action-Reaction! Rocket. Online at https://www.teachengineering.org/activities/view/cub_mechanics_lesson04_activity2.

Accessed 6 September 2018.

National Aeronautics and Space Administration. 2014. Water rockets. Online at

 https://www.grc.nasa.gov/WWW/K-12/rocket/BottleRocket/historyofrocketrypostconfact.htm . Accessed 6 September 2018.

 

Sciencelab.com. 2013. Material safety data sheet acidic acid MSDS. Online at    

http://www.sciencelab.com/msds.php?msdsId=9922769. Accessed 4 September 2018.

 

 

Science Fridays. 2014. Balloon rockets. Online at https://www.sciencefriday.com/educational-resources/balloon-rockets/. Accessed 4 September 2018.

 

Todd Platzer.2017. Do not use baking soda on the skin .Online at  

https://zerocares.com/not-use-baking-soda-skin/. Accessed 4 September 2018.