14 实验：用打点计时器测速度397096(国外英语资料).docVIP

14 实验：用打点计时器测速度397096(国外英语资料) Methods of investigating physical problems. Basic level Whats the use of the 1. point timer? The tape is joined to the moving object, that is, the object drives the tape to move together, so that the timer is punched on the tape A series of dots; the distance between the points on the tape represents the displacement of the object at the corresponding time interval. So, dot the timer An instrument is a device for recording the displacement of an object within a definite time interval. 2. the working principle of point timer There are two kinds of dotting timers commonly used in Physics Laboratory in middle school, namely electromagnetic dotting timer and electric spark timer. There is a coil in the solenoid point timer, and the vibrating plate is inserted in it (see Figure 1.4 - 1). When the coil is connected When the current is supplied, the vibrating plate is magnetized repeatedly, which is equivalent to the N pole of the magnet for a while, and is opposite to the S pole of the magnet for a while. Thus, under the action of a permanent magnet (polar invariant), the vibrating piece vibrates and drives the vibrating needle to vibrate up and down. An electric spark timer is a paper disk that sends a pulsed current through the discharge pin of the positive electrode and the toner paper tray to the negative electrode The shaft causes a spark discharge (see teaching material Fig. 1.4 - 2). The spark evaporates the toner from the toner disk onto the tray and hits it Make a series of points. 3. how do I install tape? Using an electromagnetic point timer, the tape is mounted on the paper tape. The method of installing the tape is to pass the tape through the stop frame and from the carbon copy The paper is lined with an excess pressure paper box, and the other side of the limiting hole can be worn out. There are two ways to set up paper tape on an electric spark tape using an electric spark timer: one is to use a tape from the toner When the di