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Category Archives: Center of mass

School Project | Walk along Glider

WOW It WORKS  introducing “Walk Along Glider ” to Anderson primary School , GAIA Club members .

Anderson primary school | walk along gliderSchool project

Walk Along Glider | The basic theory of flight

Demonstrating the  4 basic forces at work – Gravity , Lift , Thrust and Drag to children . But what happens when the centre of Gravity or mass is offsetted ? Well a piece of paper with a 5 cent coin taped to the edge of the paper will not fall vertically downwards !!

primary school walk along gliderprimary school walk along glider

Walk along Glider | How does it work ?

Not only does children get as chance to understand  how thrust is created through the board onto the walk along glider but they will learn about

  • how shifting of centre of gravity or mass affects flight
  • the use of ailerons of the glider
  • Stalling and nose-diving of glider

Children gets a chance to work in teams , show off their work and create their own wing designs

school project | Anderson primary schoolschool project | Anderson primary school

anderson primary school | walk along glideranderson primary school | walk along glider

Walk along glider | Learning is fun

At the end of the walk along glider project , children

  • learn about the 4 basic  forces – gravity , lift , thrust and drag
  • learn about stalling and nose diving of glider
  • learn how to optimize flight of the glider via shifting the centre of gravity and the use of ailerons
  • having lots of fun

anderson primary school | walk along glider

anderson primary school | walk along gliderGAIA Club | Anderson Primaty School

Wow it works | Balanced Robot

balanced robot

The wow it works balanced robot is actually a continuation of “balance and motion” . In the case of balance and motion,  we did not manage to perform the balancing act on a pulley , because we had  problems sourcing  for a small pulley . This time we managed to locate a reasonable small pulley , and therefore we try to complete what we did not achieve the last time . So here it is


Balanced robot | using a clothespin

Before we do the balanced robot , we tried using a clothespin because it is very simple to balance it on a thin thread . We can always decorate the clothespin with a head and  arms , since we already have the 2 legs resting and balancing on a thread

balanced robot

Wow it works | balanced robot on a pulley

Here is a balanced robot using a toilet paper roll on a pulley . Unlike the clothespin , note that we only make use of 1 balancer for this robot  .

wow it works

Here is our R2D2 balanced robot from wow it works . Not quite like R2D2 yet but soon . Noticed how the thread is balanced on the pulley .

balanced robot

Here is the video with the balanced robot sliding down a thin thread . Next time we will make the robot slide down a hard wire which we can bend left and right , up and down .  So maybe next time we will get to see

  Wow it works | Simple balanced robot

In a  nutshell , it is very simple to achieve balance . As long as the center of gravity or mass is below the pivot point or fulcrum , the object should easily maintain its balance . So here it is , balanced robot from wow it works


Wow it works | Gravity robot enhancement

gravity robot

This is the third enhancement to the Gravity robot by Wow it Works . The outcome of the Rochester event identify certain areas of improvement for the gravity robot

Gravity robot | New suit and shoes

Other than giving a “face” to the robot , this time we added a suit and shoes . Well its more colourful now but kids will have more work to do if they wanted to decorate their gravity robots as well . The “face” and “suit” provides better balancing to the overall gravity robot

gravity robotgravity robot

Wow it works | Balance and motion

balance and motion

In the “wow it works”  balance and motion activities , at the end , we need to apply newly acquired knowledge as to how we can balance a pencil on a finger  . Possible ? Let’s try .

Wow it works | Center of Gravity

center of gravity

In this wow it works activity , kids learn about center of gravity or mass on an incline plane . What happens to a ball on an incline plane ? It rolls down of course . But why? Here we get kids to build the gravity robot that literally “walk” down the slope . To be able to move , we first need to shift the center of gravity . But that would cause some imbalance , and that is precisely what happen to the gravity robot

Wow it works | Balanced dragonfly

wow it works balanced dragonfly

This wow it works program for kids is also about center of mass (Gravity) .

Here we have photographs of a bird and also a dragonfly  in equilibrium . The bird  is something that we bought when we were in Australia in 2002 while the  balanced dragonfly , which is made of bamboo is from ZhangJiaJie , China , during one of our holidays in  2011 . We are not sure if these are available locally in Singapore , but you can made them yourself using cardboard . Noticed the similarities between the 2 creatures !!

Wow it works | Gravity robots

wow it works gravity robots

The “wow it works” gravity robot was inspired by the book , titled “Robotics” written by Kathy Ceceri . There are about 20 robotic  projects in this book . The book is  meant for kids age 9 to 12 years old . It is an excellent book to introduce kids to the world of robotics . The only problem  is that we can’t find the book in Singapore , except buying one on-line . Luckily after a few calls to the regular bookstores in Singapore , there is only ONE available at Kinokuniya at Orchard . So we picked up the ONE and only copy  ( oops .. sorry folks , you have to wait for them to replenish unless you buy it on-line )

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