lee's classroom

(another MPPS global2.vic.edu.au weblog)

May 29, 2018
by leesclassroom
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Save The Egg Challenge

Today we begin working on our science project. Our challenge is – Can you design a bike or football helmet to withstand impact and reduce the likelihood of a brain injury? 

 

Students will be using their knowledge of forces acting on an object in a crash or fall, and apply a design process to develop a safe container for an egg that is dropped from a set height.

The design must:

  • Stay on the head.
  • Keep the skull from cracking.
  • Allow for the user to see through an opening at the front.
  • The helmet will be made from recycled materials.

Students will:

  • work in teams
  • solve design problems
  • make modifications, change ideas and maybe make
  • mistakes
  • use peer feedback to improve their designs using a design process like engineers and designers experiment, test, refine and try again

Throughout this process students will develop a folio of work that demonstrates their learning.

 

The two videos we looked at to help us understand why this is such an important issue were:

http://www.abc.net.au/btn/story/s2986284.htm

http://www.abc.net.au/btn/story/s4716349.htm

(Two points to note:

  • Even if helmets are worn, they don’t completely eliminate the risk. They could give the player a false sense of security and they could put their body on the line even more.
  • This is why it is important to follow MPPS’ no tackling rule)

May 14, 2018
by leesclassroom
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Forces: Gravity

The force that pulls things to the ground on Earth (and other planets) is called gravity.

Gravity also holds Earth and the other planets in their orbits around the Sun.

Gravity is a very useful force – It keeps us on the Earth, and keeps the Earth and the other planets revolving around the Sun. It holds everything together, which is why it has been called  ‘The Universal Glue’.

Although the force of gravity also exists on the Moon  it is not as strong as it is here on Earth. This is because the Moon is much smaller than the Earth it is not as heavy as the Earth, and so gravity is much weaker there.

In the past people thought that heavier things fell faster than light things. Galileo, an Italian scientist from the 1600’s, conducted some experiments and found that things with different weight fell at approximately the same speed.

 

 

 

 

 

 

 

 

 

 

Below are the videos we looked at in class:

Defining Gravity: Crash Course Kids #4.1 

Down to Earth: Crash Course Kids #4.2 

The Spinning Ball experiment

 

Another resource is:

http://www.bbc.co.uk/schools/gcsebitesize/science/edexcel_pre_2011/space/gravityforceandweightrev3.shtml (just this page) 

 

Some extension links:

Danger! Falling Objects: Crash Course Kids #32.1

Over (to) The Moon: Crash Course Kids #13.2

May 9, 2018
by leesclassroom
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Forces: Friction

Friction is a force between two surfaces when they are moving or sliding across each other. For example, when you try to push your hand across a table. Friction will make this difficult.

Friction works in the opposite direction to which the object is moving. Friction always slows a moving object down, and may even stop an object from moving.

The amount of friction depends the two surfaces.. The rougher the surface, the more friction, the smoother the surface, less friction.

Friction also produces heat. If you rub your hands together quickly, can you feel them get warmer?

The ways friction can help include:

  • preventing our shoes from slipping on the footpath when we walk
  • stopping car tyres from skidding on the road
  • allowing bicycle brakes to grip and slow or stop a turning wheel

Sometimes we want to reduce friction. For example, we use oil to reduce the friction between the moving parts inside a car engine. The oil holds the surfaces apart and can flow between them. The reduced friction means there is less wear on the car’s moving parts and less heat produced.

Ice causes very little friction, which is why it is easy to slip over on an icy day.

However, this is a good thing for ice skating and sledging.

 

 

 

Below are the videos we looked at in class:

Friction is a Force

https://www.youtube.com/watch?v=n2gQs1mcZHA

https://www.youtube.com/watch?v=ybpFEB6Mt88

Floating Rice Bottle — How to Float Rice in a Bottle Science Experiment !!

 

Another resource is:

http://www.bbc.co.uk/bitesize/ks2/science/physical_processes/friction/read/1/

 

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