Pull Back Car

Principle:The elastic energy stored in the bamboo stick is converted in the kinetic energy of the pull back car.It works on the principle of , an object experiences an acceleration when its velocity changes.
Applications:
The Pull Back Car is designed for small-scale experiments in the classroom. Children use it as a racing car.
Items Required to make:
1.Empty Soap Box
2.Four wooden wheels
3.Rubber bands
4.Bamboo stick
5.Cycle spokes
Fun Facts to know:
These Pull Back Cars can be used as Skate board pullbacks, Police car pullbacks,Super speed pullbacks and Race cars.

Structures

Activity: Fold postcards in various cross sections to make 14 cm high columns.
Which cross section is the most efficient? Make two columns of the same cross sectional area, but one tall and the other short. Which supports more load?
For the same cross-section of column, how does the load bearing capacity depend upon height?
Things to Learn:
As the number of sides increases of the polygonal prisms it becomes more and more stronger
A solid cylinder is the one which would take the maximum load for the given cross section.
Items Required to make:
Paper & Glue
Weights (like books or sand bags)
Spring balance

Fun Facts to know:
Cylindrical columns are the most frequently encountered columns in daily life, now you know why! ?