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 15- Collisions in two dimensions

Purpose: Look at a two-dimensional collision between two steel balls or steel and glass ball and determine if momentum and energy are conserved. Theory: An elastic collision is an encounter between two bodies in which the total kinetic energy of the two bodies after the encounter is equal to their total kinetic energy before the encounter. In this lab we will determine if the momentum and energy are conserved after collision by checking the data collected by the video. The momentum conserve both on the x-axis and the y-axis. So we can determine the change of the momentum in a two-dimensional collision by checking the total momentum in each direction. Setup: Set the stationary ball on a leveled glass table. Aim the rolling ball so that it hits the side of stationary ball. Use the phone’s slow motion capture function to collect data as a camera. Steel ball and steel ball: We firstly use two steel balls. After getting data from the phone, we use LoggerPro to analyze...

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