Seeing Sound Engineering a Future February 22, 2014

Who we are Dr. Sally Pardue – – Director of the Oakley STEM Center, – Associate Professor of Mechanical Engineering Vanessa Perez Hannah Crouch Neil Pierce

Challenge You are asked to help a group of 1 st graders understand what sound is and how we hear. You are asked to explore activities and decide if they will help 1 st graders to see sound. You also think it might be fun for these young kids to learn about jobs that relate to sound.

Generate Ideas What is Sound? How can we see what we hear? Jobs?

Multiple Perspectives Ask someone for their story Find out what they know What is their job, how doe they use sound in their work or hobby

Research and Revise ACTION LEARNING Walkabout Stations to See Sound – Transverse Waves with Spring – Whoosh! – Tuning Forks – Noise Makers & Fold a Popper Sound Measurements Hearing and Hearing Loss

Waves with Spring Two people, each holding an end of LONG spring – Stretch it out a bit, not too much, but the coils need to be expanded, not too much sag in the middle – One person holds an end steady – still. – The other person moves their end up and down gently, slowly at first and we see transverse motion – Then the person moves with rhythm at a faster rate and we see a different pattern A Slinky at home on a Table –

Tuning Fork The transverse motion of the forks is what generates the sound we hear Gently tap the longest fork against green block Thinking…How does a cymbal work?

Whoosh!

Longitudinal Hoops

Slinky Another way to see longitudinal waves These are also called compression waves

Paper Poppers %22Popper%22 %22Popper%22 This will serve as a sound generator for us in the next activity

Measuring Sound With a hand-held data acquisition device – Vernier, small computer – Microphone Go ahhh – feel your throat See what the signal looks like on the screen of the Vernier hand-held unit

Microphone Model A membrane that moves in a back and forth or up and down transverse way The membrane translates motion into an electrical signal as voltage we can measure the voltage and Display the voltage change with time on The screen of the hand-held unit

Ear Model

Loud Noises and Hearing Loss and-hearing-loss/noise-how-loud-is-too- loud.html and-hearing-loss/noise-how-loud-is-too- loud.html and-hearing-loss/hearing-loss-what-it-sounds- like.html and-hearing-loss/hearing-loss-what-it-sounds- like.html

Go Public What would you share with the 1 st graders about how to see sound? Practice telling your story with your family