lab 5- Trajectories

Purpose

Predict the impact point of a ball on an inclined board with our understanding of projectile motion.

Process

1. Set up the apparatus as the lab guide shown.

2. After the apparatus is set, launch the ball from the top of the track and collect the data when the ball falls on the ground. This step should be repeated to make sure the data is convincing.

3. Then set an incline which is 49º ± 1º to the ground.

4. Launch the ball again to get the point where the ball falls on the incline. Repeat this step to make sure the data is convincing.

Analyze

From the second step we can derive the horizontal voltage of the ball with the height H of the table and the distance X.

From the data we get from step we can get the

When the ball hit the incline,

So we can finally derive the Distance the ball hit at the incline. Compare to the actual distance and we can find its error is , which is quite small.

Conclusion

The error may be caused by friction and air resistance, which we did not take into consideration when we calculate the theory value.

In this lab we learned how to predict the impact point of a ball on an inclined board. We can use the formula below to analyze it.

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Lab 19: PHYS 4A Lab--Conservation of Energy/Conservation of angular momentum

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lab 2 Free Fall Lab- determination of g and some statistics for analyzing data

Purpose Determine the gravity coefficient by determine the velocity of a falling object with spark generator and spark–sensitive tape. Compare the result with the actual value to calculate the error from systematic nature. Procedure The spark generator is connected to a cylinder which would fall with a distant of 1.5 m and was linked with the spark-sensitive tape. When the cylinder released, the spark generator left sparks on the tape with a frequency of 60 per second. After measuring the distant between sparks and analyzing those data, we can finally get the local gravity coefficient. Method of Fitting From the sparks we can derive the time of each spark. To ensure the velocity’s accuracy, we should choose a mid-interval time and the corresponding mid-interval velocity. When we plot velocities in excel and plot the fitted curve, the slope of the fitted curve is the gravity coefficient. Conclusion and Analysis The gravity coefficient determined by...

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