Newton first law demonstrating instrument

Abstract

The invention provides a newton first law demonstrating instrument, and relates to a teaching instrument. The newton first law demonstrating instrument comprises a table body of which two ends have different height, and a chute which is formed in the table body and has a plurality of frictional coefficients. The newton first law demonstrating instrument is characterized in that the chute is suitable for a small ball to linearly roll; a small ball synchronizing applying device is arranged at the high end of the table body; a camera connected with an audio-visual education device is arranged at the low end of the table body. According to the newton first law demonstrating instrument, the small ball is used as an experimental object; the influence of the frictional force outside the chute surface can be avoided; the experimental result is accurate; the instrument can be connected with a computer and a projection device, which facilitates experimental observing; the instrument is applicable to audio-visual education.

Description

technical field [0001] The invention relates to a teaching instrument. technical background [0002] Newton's first law is an important content of junior high school physics teaching. To enable students to fully understand the relationship between force and motion, it must be demonstrated with the help of teaching instruments. However, there is no special Newton's first law demonstrator in teaching now, and it is often difficult to obtain satisfactory results by using local materials for simple demonstrations. "Experimental Teaching and Instruments" No. 1, 2010, published Zhang Jian's "Improvement of Newton's First Law of Motion Demonstrator", which is to set three lanes on the skateboard, such as towel surface, cardboard surface, and wooden board surface. Set up a trolley on the ground, and compare the sliding speed of the trolley on surfaces with different friction coefficients by releasing the trolley at the same time. Although the original method has been improved,...

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Problems solved by technology

Although the original method has been improved, there are still some problems: first, the use of small cars for experiments cannot objectively reflect the effect of the friction surface due to the influence of internal friction; second, the release of small cars is difficult to synchronize; third, small cars are easy to run The wheel rubs against the edge, which seriously affects the accuracy of the experimental data; Fourth, the observation effect of the experiment is limited and cannot be adapted to the audio-visual teaching

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