Last year Keely was assigned a science project, and she decided to test restraints on ski lifts. She built a chair out of a hanger wire, used Barbie as the test model, and subjected Barbie to the force of gravity by hanging a paper basket from her toes and slowly adding marbles to this basket.
Barbie without restraints fell with little force subjected. Barbie with a bar restraint was propelled forward but was deterred from a fall by the bar. Barbie with a restraint belt fared the best with little or no movement no matter the force.
It will be interesting to see how the design of chairs will change in decades to come.