Frictional force demonstrator

Abstract

The invention discloses a frictional force demonstrator which comprises the components of a horizontal table, a sliding device, a displacement sensor, a motor pulling device, a friction block, a forcemeasuring device, a pointer, a first display device, a switch panel, a second display device, a chute, an amplifying device, an image acquisition device, a computer, a projector, a printer, a blackboard writing device, a projection device and a horizontal measuring device. According to the frictional force demonstrator, according to the indicating condition of the pointer on a scale plate, and amplifying a relation between a slide block pulling time by the motor pulling device and a movement distance of the slide block on the first display device, a relative motion trend direction and a relative motion direction are determined through observing a burr direction on a burr flexible plate by a magnifier, and furthermore the burr direction on the burr flexible plate in a continuous time period in the relative motion trend and the relative movement is acquired through the image acquisition device, and furthermore a burr direction image is amplified and displayed on a projection cloth curtain, thereby quickly, visually and accurately demonstrating the frictional force direction and the relative movement trend direction.

Description

technical field [0001] The invention relates to the field of physics teaching demonstration instruments, in particular to a friction force demonstration instrument. Background technique [0002] The teaching of friction force in physics teaching is a difficult point. If two objects that are in contact with each other and are relatively stationary, under the action of an external force, if they only have a tendency to slide relative to each other but do not slide relative to each other, the force that prevents relative slide between their contact surfaces is called The "static friction force" is tangent to the contact surface and opposite to the direction of relative motion. An object changes with the change of external force relative to it. When the static friction force increases to the maximum static friction, the object will move. Sliding friction is the force that hinders the relative motion between objects in contact with each other, not necessarily the force that hin...

AI Technical Summary

Problems solved by technology

[0005] The embodiment of the present invention provides a friction force demonstrator, which is used to solve the problems in the prior art that the direction of friction force and the direction of relative motion trend cannot be demonstrated, and the static friction force, maximum static friction force and sliding friction force cannot be demonstrated intuitively and accurately. Problems with the process of change

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