Calculating Average Acceleration This activity will help you meet these educational goals:
• use real-world data captured on video, make observations, analyze data, and communicate your results in written form
• apply mathematical and scientific tools and knowledge to analyze real-world situations
• employ online tools for research and analysis
Directions
Read the instructions for this self-checked activity. Type in your response to each question, and check your answers. At the end of the activity, write a
brief evaluation of your work
Activity
In this activity you will use Tracker to observe the downward acceleration of a ball as it falls. Open the ball drop 1 e experiment and play() the
video
Part A
Now rewind the video and step forward lone frame at a time. Notice how the values for each frame are highlighted on the data table and
the graphs. Describe and explain your visual observation of the ball falling

To understand the behavior of the electric field at the surface of a conductor, and its relationship to surface charge on the conductor. a conductor is placed in an external electrostatic field. the external field is uniform before the conductor is placed within it. the conductor is completely isolated from any source of current or charge. part a: which of the following describes the electric field inside this conductor? it is in the same direction as the original external field.it is in the opposite direction from that of the original external field.it has a direction determined entirely by the charge on its surface.it is always zero. part b: the charge density inside the conductor is: 0non-zero; but uniformnon-zero; non-uniforminfinite part c: assume that at some point just outside the surface of the conductor, the electric field has magnitude e and is directed toward the surface of the conductor. what is the charge density η on the surface of the conductor at that point? express your answer in terms of e and ϵ0