Horizontal projectile motion law demonstration instrument

Abstract

For better verifying the motion law of horizontal projectile motion, the invention provides a horizontal projectile motion law demonstration instrument mainly composed of a power supply, a control circuit box, an inverted L-shaped wooden frame, an electromagnetic magnet, small balls, a spring, a sliding rail, a photoelectric switch, an inverted trapezoidal elastic plate, a wood plate, timers, carbon paper, white paper, a resistor, a capacitor, a chip, a relay, a diode and the like. Electromagnetic magnet, photoelectric switch and relay design circuits are used for controlling the three small balls to simultaneously start to move. The two timers are started at the same time and separately time to display the exact time; the horizontal projectile motion and the vertical sub-motion are compared, the horizontal projectile motion and the horizontal sub-motion are compared through traces left on the white paper by the carbon paper when the inverted trapezoidal elastic plate is impacted by the small balls, the experimental circuit design is ingenious, the difficulty of obtaining experimental data is reduced, the operability of experiments is improved, and the development of experimental exploration teaching is better facilitated.

Description

technical field [0001] The invention relates to a middle school physics teaching and experimental instrument, in particular to an instrument for demonstrating the law of flat throwing motion. Background technique [0002] In the second section of the fifth chapter of the high school "Physics" Compulsory II (PEP Edition) - "Platform Throwing Motion", students need to understand that the two sub-movements of the flat throwing motion can be equivalent to the vertical direction The free fall motion in the horizontal direction and the uniform linear motion in the horizontal direction, the existing experimental instruments in the book only involve the demonstration of the free fall motion in the vertical direction, and it is all based on the impact sound of two small balls falling to the ground to judge whether they land at the same time, but After the ball hits the ground, it will not stop immediately, and there will be several consecutive impact sounds. Because there is no exact...

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Problems solved by technology

[0002] In the second section of the fifth chapter of the high school "Physics" Compulsory II (PEP Edition) - "Platform Throwing Motion", students need to understand that the two sub-movements of the flat throwing motion can be equivalent to the vertical direction The free fall motion in the horizontal direction and the uniform linear motion in the horizontal direction, the existing experimental instruments in the book only involve the demonstration of the free fall motion in the vertical direction, and it is all based on the impact sound of two small balls falling to the ground to judge whether they land at the same time, but The ball will not stop moving immediately after it hits the ground, and there will be several consecutive impact sounds. Because there is no exact time display, some students will question it, which is not conducive to students' understanding and mastering the key points of this knowledge

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