Posts Tagged ‘balance’

Centre of gravity

Monday, August 16th, 2010

gymnast by euze on flickr

Ever wondered how gymnasts and acrobats can do things like this?  We’re about to discover how.  We will learn about centre of gravity (or centre of mass) and stability.

  • Why are Formula 1 racecars so low?
  • Why is it difficult for a tightrope walker to balance on a tightrope?
  • On a double decker bus why shouldn’t all the passengers sit upstairs?
  • Why does a wineglass have wide base?

We will do a lab to identify the centre of gravity of different regular and irregular shapes.  This is the instruction sheet. Centre of Gravity G10 IntSci2

Levers & moments

Sunday, August 8th, 2010

Warning seesaw ahead by whittaker_colin on flickr

This is the presentation we used in class Levers & Moments and I am attaching the worksheet as well. Identifying levers

We’ll do a lab activity where we look at balancing a beam using various weights.  Investigating moments

Take a look at this useful site beforehand, so that we can understand moments and turning forces.

And this cartoon clip is helpful in explaining the concepts of balancing moments too.

Finally, here is a worksheet with practice questions on the application of moments using everyday examples.  Moments homework G10 IntSci2

How we hear

Friday, March 26th, 2010
Malayan Flying Fox 2 by littleREDelf on flickr

Malayan Flying Fox 2 by littleREDelf on flickr

Sound waves travel through the air, and we are able to detect them, using our ears.  So, let’s start by looking at a diagram of the human ear, and relate the structure to the function.  You don’t need to be able to draw the diagram, just label it, and know what each part plays in allowing us to hear.  Use this site to learn about ear structure and how we hear. 

Now let’s try and answer these questions:-

  • Why do we have two ears?
  • What is perfect pitch?
  • How do cochlear implants work?
  • How is an owl’s face like a satellite dish?
  • What is ultrasound?  How do we use it?
  • What is echo-location?  Bats and dolphins use it all the time. Can humans learn to as well?

Thanks to Mr Boulton for finding these resources.