Free fall test device for physics lesson

Abstract

The invention relates to a free fall test device for a physics lesson. The free fall test device comprises an electromagnetic suction disc, an inner barrel, an outer barrel, a movable contact amphenolconnector, a static contact amphenol connector and a control assembly containing a timer and a switch unit. The electromagnetic suction disc is powered off instantaneously when the timer starts to count time by a control circuit and the electromagnetic suction disc is kept in the powered-off state in the whole timing process. The outer barrel faces the lower side of the electromagnetic suction disc and a clamping rail is arranged on the upper part. The bottom of the inner barrel is closed, a guide groove matched with the clamping rail is formed in the outer wall, and the clamping rail and theguide groove can be relatively fixed to a plurality of preset heights. In any preset height position, the movable contact amphenol connector can be connected to the static contact amphenol connectorto establish a precondition when the timer starts to count time. A fall block is adsorbed to the electromagnetic suction disc. The fall black can fall into the inner barrel to collide with the bottomwall, so that the inner barrel moves downward relative to the outer barrel, and the movable contact amphenol connector and the static contact amphenol connector are separated to stop timing. The operational experiment convenience can be enhanced, and the probability of experimental failure or experimental deviation is reduced.

Description

technical field [0001] The invention relates to the field of teaching experimental devices, in particular to an experimental device used in experiments on the law of motion of free-falling bodies in high school physics classes. Background technique [0002] Free fall is a uniformly accelerated motion. In the process of physics teaching, in order to intuitively understand that it is a uniformly accelerated motion, a verification experiment class is offered. [0003] The current experimental devices for simulating free-fall motion mainly include brackets, dotting timers, paper tapes, hooks, weights and rulers. By using the continuous dots left by the dot timer on the paper tape, and the fixed time of each dot of the dot timer, the vertical displacement and the corresponding time are finally obtained to complete the verification experiment . If the obtained multiple points (points drawn on the experimental paper) can pass through the same straight line, it proves that the fr...

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Problems solved by technology

[0007] Aiming at the problems of inconvenient single-person operation in the currently used free-fall experimental device, which may easily lead to experimental failure or excessive error, the present invention provide

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