Take the cardboard back of a pad of paper and cut it into a square. Then support the cardboard horizontally with blocks at each end and apply a weight in the middle. Measure the de?ection. Next rotate the cardboard 90? and repeat the experiment using the same weight. By what factor do the two de?ections differ? By what factor does the elastic modulus, E, vary with direction? Why was the cardboard used for the backing of the pad placed in the orientation that it was?