气垫上的直线运动（Rectilinear motion on the air cushion）.docVIP

气垫上的直线运动（Rectilinear motion on the air cushion） 2 motion experiment on the air track The purpose of teaching: 1. learn to use air track and timing counting instrument. 2. to observe the uniform linear motion, velocity measurement to slide. 3. by measuring the acceleration of the slider, Newtons second law. Content of courses： An experimental instrument L-QG-T-1500/5.8 type air cushion guide, small gas MUJ-5C/5B, timing and counting velocimeter, vernier caliper, electronic balance, weight, weight, weight plate. The main instrument: 1. air track air cushion guide is a set of experimental instrument precision, it uses gas compressed air into the guide cavity by the hole jet stream on the surface of the rail, forming a thin film of air between the guide rail and the slider (or air), the slider float, the slider can make approximately linear motion without resistance in the rail. In use, to avoid severe vibration and impact pressure deforms before use to wipe clean with alcohol, should be used to ventilation, the slider on the rail, is strictly prohibited without ventilation on the slider. After use, remove the slider to turn off the gas supply. After the experiment will guide wipe cover dust cover. 2.MUJ-5C/5B timing counting apparatus Time 1 (S1): the measurement of light time on the photoelectric door, the door was blocked from a start time, stop time to light the end. Time 2 (S2): measurement of time interval of the photoelectric door two times light, from the photoelectric first blocked start time, stop time is blocked to second times. Two, the experimental principle 1. speed measurement The concave light on the slide block and a narrow, when the slider in a position through the photoelectric door when the light shines on the photoelectric element will cover the light. Because the light is the width of a certain length of time, and the object shading through the photoelectric door speed is inversely proportional to. The average velocity measurement of the slider, on