Today I have started giving finishing touch to the following experiments.
1. Frequency of Oscillations of Spiral Spring

2. Uniformly accelerated motion on an inclined plane
3. Conservation of momentum.

For all these experiments  I am using a photo-gate (Light-sensor) and motion detector (Ultrasonic Sensor). The code written for ultrasonic sensor is giving all the required result. Facing difficulties in accessing two photogates…. working on this issue since last week …..
………once this problem is solved we will get wonderful results from these experiments.

Today I continued to  work with Documentation. Received additional Ultrasonic sensors SRF 05  today by courier. Did the testing work for all ten pieces of srf modules. They all are working good.

Now I can apply all trial and error methods to explore…… 🙂

Wrote three programs for time measurement using photo-gates and explored the use of time measurement functions like r2rtime r2f time and multir2rtime and updated changes to Git repo.

Facing some difficulties in an experiment while using two photo-gates simultaneously for time measurements. One gate can be connected to SEN input of ExpEYES. Tried the other gate with IN1 and IN2 …it did not work. Need to study functioning of this gate and inputs IN1 and IN2.

Last time when I did this experiment, apparently it worked, I did use the old photo-gate(the design of the old photogate is different than the new one). We must find a way to use the new photo gate as its design is simple ( no extra transistor), with terminal other than SEN. I am studying this programmers manual and user manual to explore the possibilities…..

There are some

Today started creating documents for experimental setups and procedures. This week I have set a target for myself that I must complete documentation work for at least five mechanics experiments and a few sound experiments. I have already prepared draft copies …

Edited programs for using SRF 05 sensor. Did the experiments on linear air track to obtain position -time plots.

Graph for body moving towards the sensor with constant velocity.

Graph for body moving away from  the sensor with constant velocity.

A body bouncing off from a point near the sensor…

We should now try for avoiding irregular peaks in the readings.

This is a schematic diagram for the acceleration experiment I am working on.

Acceleration measured in this experiment is the sine component of ‘g’.

So now we can do this experiment by two methods.

1. By using motion sensor …. the data is recorded with uniform time intervals.
2. By using Photo-gates …… the time intervals are not uniform. time taken for traveling different distances can be measured and data can be used to calculate acceleration.

Today tried to measure acceleration due to gravity using motion of glider on an inclined plane.

Used the pickup i designed yesterday and photo-gate to measure acceleration. The results are very good and are in close agreement with theoretical calculations.

For motion on an incline acceleration along the inclined plane is g’ = g sin(theta) where (theta) is the angle on inclination. wrote a small python code using time measurement functions of ExpEYES library.

Used this code for measuring time…

import expeyes.eyesj

p= expeyes.eyesj.open()

a = p.multi_r2rtime(3)  # time for 1 cycle

b = p.multi_r2rtime(3,2)  #time for  4 cycles, 2 rising edges are skipped

print a

print b

Could not work on the project today, had to study for my exam. Tomorrow appearing for exam of B.Ed. Course through IGNOU.

Will be back tomorrow evening for happy coding………

Cheers….