{'fraction_non_alphanumeric': 0.015350877192982455, 'fraction_numerical': 0.0, 'mean_word_length': 5.006578947368421, 'pattern_counts': {'":': 0, '<': 0, '<?xml version=': 0, '>': 0, 'https://': 0, 'lorem ipsum': 0, 'www.': 0, 'xml': 0}, 'pii_count': 0, 'substrings_counts': 0, 'word_list_counts': {'cursed_substrings.json': 0, 'profanity_word_list.json': 0, 'sexual_word_list.json': 0, 'zh_pornsignals.json': 0}}
Machine-augmented composites displaying control of unusual spin for a bouncing ball

One unique property of a Machine Augmented Composite (MAC) is its ability to convert a compressive force into a shear force, and vice versa, simply by the geometry of its angled sidewalls. We have discovered that a non-spinning ball dropped at a normal angle onto the MAC’s surface rebounds from that surface at an angle different from the normal and develops a significant rotational velocity. The MAC can be designed so that the spin imparted on the ball is either clockwise or counterclockwise and tailored so that the ball’s oblique angle rebound is either positive or negative from its normal angle. Through finite-element analyses and experiments, the magnitude and direction of the spin can be precisely controlled by tailoring the stiffness of the MAC through the properties and dimensions of its constituent materials.