Pulling a Cloth From Under a Beaker
A beaker is placed on top of a cloth, on top of a stool. The cloth is pulled quickly from underneath the beaker, while the beaker remains stationary. The impulse of the net force is made very small by reducing the time over which the cloth acts on the beaker. In other words, the force of the cloth does not act on the beaker long enough to accelerate it, so it does not move.