Bungee from the Bridge

Bungee Jumping off the Cleddau Bridge Faculty of Architecture, Computing and Engineering University of Wales Trinity Saint David

Email: engineering@uwtsd.ac.uk

UWTSD Swansea

Website: www.uwtsd.ac.uk/face

1: Bungee Jumping off the Cleddau Bridge - Freefall How long before the bungee starts to go tight?

Constant acceleration equation:

s = distance travelled, which is the length of the bungee = 8m u = initial velocity which is zero t = time taken a = acceleration which, due to gravity, is 9.81ms-2

• Get your phone out and time the next person who jumps • What did you get? Why was it different?

Passionate about extreme sports?

Want to get into the industry?

Interested in the science of what is going on?

Want to design and develop the equipment used? www.uwtsd.ac.uk/beng-extreme-sports-engineering

2: Bungee Jumping off the Cleddau Bridge - starting to stretch the bungee How fast will I be travelling before the bungee starts to slow me down?

Constant acceleration equation: v = final velocity

= 0 + 9.81 x 1.3 = 12.5m/s = 28.1mph

• Notice it doesn’t matter how heavy you are!

• Do you think this is true? Why?

Passionate about extreme sports?

Want to get into the industry?

Interested in the science of what is going on?

Want to design and develop the equipment used? www.uwtsd.ac.uk/beng-extreme-sports-engineering

3: Bungee Jumping off the Cleddau Bridge - Stretching the bungee How quickly will I decelerate?

With your phone, time how long it takes between the bungee starting to go tight and the jumper reaching the bottom for the next jumper.

Constant acceleration equation:

• This is the deceleration in ms-2 • Why do you think that your answer may be different to what actually happened?

Passionate about extreme sports?

Want to get into the industry?

Interested in the science of what is going on?

Want to design and develop the equipment used? www.uwtsd.ac.uk/beng-extreme-sports-engineering

4: Bungee Jumping off the Cleddau Bridge - Reaching the bottom How close to the water will I get?

Constant acceleration equation:

This is how far you travel when you are stretching the bungee The bungee is 8 meters long before it starts to stretch The bridge is 40 meters high 40m – 8m – how far you stretch the bungee

• This is how close the jumper got to the water • Why do you think that your answer may be different to what actually happened?

Passionate about extreme sports?

Want to get into the industry?

Interested in the science of what is going on?

Want to design and develop the equipment used? www.uwtsd.ac.uk/beng-extreme-sports-engineering

5: Bungee Jumping off the Cleddau Bridge - Force through the bungee Will the bungee break?

Newton's second law:

Guess the mass of the jumper in kg (1 stone = 6.4kg) Force going through the bungee = mass x (deceleration+9.81)

This is the force going through the bungee The breaking load of the bungee is ~12,000N

• Does this make you feel safe?! • How realistic do you think your calculations are?

Passionate about extreme sports?

Want to get into the industry?

Interested in the science of what is going on?

Want to design and develop the equipment used? www.uwtsd.ac.uk/beng-extreme-sports-engineering

Neidio Bynji oddi ar Bont Cleddau Y Gyfadran Pensaerniaeth, Cyfrifiadura a Pheirianneg Prifysgol Cymru Y Drindod Dewi Sant

Ebost: engineering@uwtsd.ac.uk

PCYDDS Abertawe

Gwefan: www.uwtsd.ac.uk/face

1: Neidio Bynji oddi ar Bont Cleddau - cwymp rhydd Pa mor hir nes i’r rhaff ddechrau tynhau?

Hafaliad cyflymiad cyson:

s = pellter a deithwyd, sef hyd y bynji = 8m u = cyflymder cychwynnol sef sero t = amser a gymerodd a = cyflymiad o ganlyniad i ddisgyrchiant yw 9.81ms-2

• Gafaelwch yn eich ffôn ac amserwch y person nesaf sy’n neidio • Faint a gymerodd? Pam fod hwn yn wahanol?

Oes gennych gariad at chwaraeon eithafol?

A hoffech ymuno â’r diwydiant?

Oes gennych ddiddordeb yng ngwyddoniaeth y peth?

A hoffech ddylunio a datblygu’r offer a ddefnyddir? www.uwtsd.ac.uk/beng-extreme-sports-engineering

2: Neidio Bynji oddi ar Bont Cleddau - dechrau ymestyn y Bynji Pa mor gyflym y byddaf i’n mynd cyn i’r bynji ddechrau fy arafu?

Hafaliad cyflymiad cyson: v = cyflymder terfynol

= 0 + 9.81 x 1.3 = 12.5m/s = 28.1mph

• Sylwch nad oes ots pa mor drwm ydych chi!

• Ydych chi’n meddwl bod hyn yn wir?

Pam?

Oes gennych gariad at chwaraeon eithafol?

A hoffech ymuno â’r diwydiant?

Oes gennych ddiddordeb yng ngwyddoniaeth y peth?

A hoffech ddylunio a datblygu’r offer a ddefnyddir? www.uwtsd.ac.uk/beng-extreme-sports-engineering

3: Neidio Bynji oddi ar Bont Cleddau - Ymestyn y bynji Pa mor gyflym y byddaf i’n arafu?

Gyda’ch ffôn, amserwch pa mor hir mae’n cymryd o pan mae’r bynji’n dechrau tynhau i pan mae’r neidiwr yn cyrraedd y gwaelod ar gyfer y neidiwr nesaf.

Hafaliad cyflymiad cyson:

• Mae hwn yn dangos arafiad mewn ms-2 • Pam ydych chi’n meddwl y gall eich ateb fod yn wahanol i’r hyn a ddigwyddodd mewn gwirionedd?

Oes gennych gariad at chwaraeon eithafol?

A hoffech ymuno â’r diwydiant?

Oes gennych ddiddordeb yng ngwyddoniaeth y peth?

A hoffech ddylunio a datblygu’r offer a ddefnyddir? www.uwtsd.ac.uk/beng-extreme-sports-engineering

4: Neidio Bynji oddi ar Bont Cleddau - Cyrraedd y gwaelod Pa mor agos i’r dŵr y byddaf i’n mynd?

Hafaliad cyflymiad cyson:

Dyma pa mor bell rydych chi’n teithio pan rydych yn ymestyn y bynji Mae’r bynji’n 8 medr hir cyn iddo ddechrau ymestyn Uchder y bont yw 40 medr 40m – 8m – pa mor bell rydych yn ymestyn y bynji

• Dyma pa mor agos i’r dŵr a ddaeth y neidiwr • Pam ydych chi’n meddwl y gall eich ateb fod yn wahanol i’r hyn a ddigwyddodd mewn gwirionedd?

Oes gennych gariad at chwaraeon eithafol?

A hoffech ymuno â’r diwydiant?

Oes gennych ddiddordeb yng ngwyddoniaeth y peth?

A hoffech ddylunio a datblygu’r offer a ddefnyddir? www.uwtsd.ac.uk/beng-extreme-sports-engineering

5 : Neidio Bynji oddi ar Bont Cleddau - grym trwy’r bynji A wnaiff y bynji dorri?

Ail gyfraith Newton:

Dyfalwch fas y neidiwr mewn kg (1 stôn = 6.4kg) Grym sy’n mynd trwy’r bynji= mas x (arafiad+9.81)

Dyma’r grym sy’n mynd trwy’r bynji Llwyth torri’r bynji yw ~12,000N

• Ydy hyn yn gwneud ichi deimlo’n ddiogel?!

• Pa mor realistig ydych chi’n credu yw eich cyfrifiadau?

Oes gennych gariad at chwaraeon eithafol?

A hoffech ymuno â’r diwydiant?

Oes gennych ddiddordeb yng ngwyddoniaeth y peth?

A hoffech ddylunio a datblygu’r offer a ddefnyddir? www.uwtsd.ac.uk/beng-extreme-sports-engineering