Answer:
Student slipping on the ice.
I think illusion or distraction
A pe dometer<span> is a device, usually portable and </span>electronic<span> or </span>electro mechanical<span>, that counts each step a person takes by detecting the </span>motion<span> of the person's hands or </span>hips<span>. Because the distance of each person's step varies, an informal </span>calibration<span>, performed by the user, is required if presentation of the distance covered in a </span>unit of length<span> (such as in kilometers or miles) is desired</span>
