September 2014 archive

The tennis ball moving machine

Easy Blog Photo

this is me and my team with our machine.

In the last couple weeks of term three all the year threes an fours had to build a machine using what we had learnt through the rest of the term. We got into groups of three and followed instructions to build our machine.We also had to name our machine. Mine was called the tennis ball moving machine. My group was Adriana, Leo and of course me. As well as building the machine and naming the machine we also had to write an explanation about how the machine works,instructions on how to make the machine and lastly write a poem about the machine (see My Machine Poem by Juliet2014.)

 

The great race!

On friday the 12th of september 2014 all the year threes and fours did the great race in the SPC with the balloon/elastic band powered cars we had been working on for the last week or two . My car worked well at home but at the race it only went 66cm! I wish it went further! After the race my car broke so I couldn’t race it again!

here is a quick snap shot of my car!

here is a quick snap shot of my car!

 

The Wheel and the Axle!

 

The wheel and axle is based around the 2nd simplest simple machine, the Lever.  The main difference between the lever and wheel and axle is that where the fulcrum was on the lever the axle is for the wheel. The other important difference is that with the wheel you have a cylinder on the end. That is all a wheel is a cylinder on the end of a lever. Now we know the simple stuff about the wheel let’s get into the deeper information. 

How it works.

To be a wheel it has to be able to turn on 360o. But not all of it should turn. Only the wheel bit turns not the axle. The axle is stuck to the bottom of the vehicle. The wheel turns because it is attached to the axle not the vehicle. As the vehicle moves forward with the axle the wheel rotates it making it go further.

How it is made.

A wheel is made by getting a plank of wood (inclined plane) grabbing a cylinder making a hole in the cylinder (not all the way through) then placing the inclined plane into the hole. Next you put the end of the axle that is not in the wheel and stick to the bottom of the vehicle.

  Why it is useful

A wheel is very useful because instead of having to push the vehicle the whole way you can just give it a small push to start and then it moves itself for the rest of the way.

Examples:  

You may see wheels on…

Cars, bikes, trucks, trams, buses and on heaps more.

 

Thanks for reading my explanation and hopefully now you know everything you need to know about wheels. That they need to be able to turn on 360o and that they are actually a type of lever.