Category Archives: Center of mass
WOW It WORKS introducing “Walk Along Glider ” to Anderson primary School , GAIA Club members .
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 !!
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
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
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
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 .
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 .
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 …
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
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 .
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
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 !!
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 )