Examining the strength of a supermarkets plastic

Aim

I have been asked to look at the strength of a supermarkets plastic-type bag. Let me test and review the plastic material bag by simply investigating just how applying a gradual raising force effects the extension with the material.

Apparatus

* 30cm by 1cm strip of plastic tote

* Stand

* Grip

* Boss

* Dumbbells (N)- 100g

* a couple of wood obstructs

* Ruler

Method

Prior to we can begin the research my group and I will need to set up the apparatus because shown within the diagram but with excluding the weights.

We is going to set up the apparatus by simply cutting a 1 by 30cm strip of plastic by a plastic bag. All of us will carry on by putting your strip among the two wood made blocks then into the clamp. We will then begin the experiment by utilizing the initial weight of 1 Newton. After applying the first weight we will then measure the entire plastic remove record the length and estimate the extension. We all will continue the experiment by adding another 1 Newton and recording the result and extension once again.

We all will continue to keep adding 1 Newton and saving the effects until the strip of plastic-type material snaps or perhaps we have documented a total of 10 outcomes.

We will certainly redo the experiment twice again in order that the results are better and we can determine an average. To make sure that we keep it a reasonable test we will make sure that individuals use the same length of plastic-type material strip each time we perform the test. When we boost the force all of us will always boost by 1 Newton to continue to keep it a fair test. We will be computing the length and extension of the plastic remove in centimetres (cm). Were doing to this to measure it.

Initial Work

Prior to completing the master plan we tested the try things out as discussed in the approach. We identified that even as we increased the force in 1 Newton that the plastic-type material strip in fact snapped beneath an average of three or more Newton’s which in turn didn’t give us enough outcomes for the experiment. We all tested this kind of 3 times and found that this was happening for each and every time we carried out the experiment. To compensate for this we have decided to boost the force by simply only a split Newton in order that more outcomes can be recorded. Whilst executing the research we performed record a pair of results while follows-

Test 1

Force(N)

Length(cm)

Extension(cm)

0

28

0

1

28. some

0. some

2

28. 8

zero. 8

3

29. several

1 . several

Experiment 2

Force(N)

Length(cm)

Extension(cm)

zero

28

zero

1

twenty-eight. 2

zero. 2

2

28. six

0. 6th

3

twenty nine

1

Experiment 3

Force(N)

Length(cm)

Extension(cm)

0

twenty eight

0

you

28. 5

0. 5

2

twenty-eight. 7

0. 7

3

28. 9

0. being unfaithful

4

up to 29. 2

1 . 2

Coming from these primary results I will see that the plastic extends to no more than 1 ) 3cm of its initial length just before snapping. These types of results will assist me with my conjecture.

Prediction

We already know that the plastic handbag is made up of polymers. These are chemical substance bonds which make up the real estate that form the plastic handbag. The polymers in which plastic-type bags are created are more commonly known as polyethylene. Polyethylene is a right chain polymer bonded. It contains chains made up of only carbon and hydrogen. The relationship that constitute the chain will be covalent provides and are held together by simply relatively poor electrostatic forces, because the relationship carbon and hydrogen that form the polyethylene are covalent it means that they share bad particals. The shown formula for polyethylene is

The stores can go on and on

The much longer the stores the stronger the plastic material.

Polyethylene is incredibly cheap to make. It is good and easily moulded.

There are pushes acting involving the particles or perhaps molecules in the polyethylene which in turn prevent the difference in shape of the material, which once forces happen to be applied may effect. Within the action of external makes the plastic bonds stretch out and begin to straighten. Now the plastic-type material is actin as an elastic. While more force is used will continue straightening till they reach a point of equal power, at this point the plastic is at a state of strain and will no longer straighten out. This is where the plastic starts to act as a plastic. In the event that more force is utilized the provides will click and the plastic-type material strip will also snap.

After taking into account from the information I actually already know and the results from my preliminary work, I foresee that since the power is put on the plastic-type material strip it will stretch because an stretchy until the force becomes so great it actually reaches a point at which it can will no longer stretch because the bonds have been straightened out and vulnerable, at this point I really believe that the plastic material strip can snap.

Benefits

Whilst performing my test I registered the following results

Experiment one particular

Force(N)

Length(cm)

Extension(cm)

0

28

zero

1/2

28

0

1

28. 2

0. a couple of

1-1/2

28. 2

zero. 2

two

28. 4

0. 4

2-1/2

twenty-eight. 4

zero. 4

three or more

28. 6

0. 6

3-1/2

28. 7

zero. 7

5

29. 0

1

Try things out 2

Weight(N)

Length(cm)

Extension(cm)

0

28

0

1/2

28

0

1

twenty-eight. 2

zero. 2

1-1/2

28. three or more

0. a few

2

28. 3

zero. 3

2-1/2

28. a few

0. your five

3

twenty-eight. 6

zero. 7

3-1/2

28. almost eight

0. 9

4

up to 29. 0

1 . 1

Test 3

Weight(N)

Length(cm)

Extension(cm)

0

twenty-eight

0

1/2

28. one particular

0. 1

1

twenty eight. 1

zero. 1

1-1/2

28. 2

0. two

2

twenty eight. 3

zero. 3

2-1/2

28. your five

0. a few

3

twenty eight. 7

0. 7

3-1/2

28. 9

0. 9

4

29. 1

1 ) 1

I actually am right now going to estimate the average intended for the extension cables of each test

Average results

Weight(N)

Typical extension(cm)

0

0

.5

0. goal

1

zero. 1

1-1/2

0. two

2

0. 3

2-1/2

0. four

3

zero. 6

3-1/2

0. almost 8

4

1 ) 0

I actually am right now going to story a line graph for each and every set of results and my personal average benefits so that they can easily be viewed and analysed.

I will use the collection graphs to find patterns and trends.

I’m also able to use the line graphs to ascertain whether My spouse and i experienced any kind of anomalous or irregular outcomes.

one particular