Impulsive force is equal to,
F=IΔt
As the time of impact is very less, therefore, the impulsive force is very large and we get hurt when we come in front of moving bicycle.
If we jump from one or two stairs we don't get hurt but if we jump from a building we get hurt .Why?
Why do we bend a bicycle on curved circular path
Why do we fill a little less air in a bicycle tube in summer?