Question

consider a child holding a helium ballon in a closed car at rest. What would the child observe the ballon to do when the car (a) acclerates from rest and (b) brakes to stop? (the balloon does jt touch the roof of the car.

Answer 1

a)

when the car accelerates from the rest upper part of the child moves back due to the inertia of the rest.since, he hold the balioon with his hand the balloone is also carried backward but the upper part of the balloone slightly moves forward with respect to the child due to inertia of the rest.

b)

when cars breaks stop upper part of the car moves forward due to the inertia of the motion. the balloone, the child slightly moves backward with respect to the child.