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Bohacek - Physics Explorations with DM Videos (Homework)

James Finch

Physics - College, section 1, Fall 2019

Instructor: Dr. Friendly

Current Score : 2 / 10

Due : Monday, January 28, 2030 00:00 EST

Last Saved : n/a Saving...  ()

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Question
Points
1 2
2/5 –/5
Total
2/10 (20.0%)

  • Instructions

    In this assignment we present several textbook question from Physics Explorations with Direct Measurement Videos 1/e by Peter Bohacek published by WebAssign

    These questions have been designed by physics instructor Peter Bohacek and are presented as a sample of the ingenious ways that dedicated educators can create their own questions and assignments using WebAssign. Using embedded video clips, these questions show interesting real-world systems and events that engage students--like fireworks, collisions, and roller coasters, some filmed with high-speed video. Grids, rulers, frame-counters and other overlays allow students to make measurements directly from the video.

    Students then use these measured values to solve problems and answer questions in WebAssign, allowing them to make strong connections between real-world situations and the physics they learn in class. Many of the questions also require students to use correct measurement technique and uncertainty propagation.

    Click here for a list of all of the questions coded in WebAssign.

Assignment Submission

For this assignment, you submit answers by question parts. The number of submissions remaining for each question part only changes if you submit or change the answer.

Assignment Scoring

Your last submission is used for your score.

1. 2/5 points  |  Previous Answers BohPhysVL1 9.IL.001. My Notes
Question Part
Points
Submissions Used
1 2 3 4 5
1/1 1/1 0/1 0/1 –/1
2/50 2/50 2/50 1/50 0/50
Total
2/5
 
You will use the following video to do this lab. Use the exact values you enter to make later calculations. Note, you will not include units in your answers.

  • Video and Lab Information

    To view the video above, you'll need to have a Quicktime player installed on your computer. Use the controls at the bottom of the video. Use the right and left arrows to advance the video frame-by-frame.

    The video above was filmed at a variable frame rate. The slow motion sections are recorded at 120 frames per second and the normal sections are recorded at 30 frames per second.

  • Data

    Use the video frame counters to determine the number of frames it takes for the train to pass the right-most edge of the green support post on the right side of the loop.
    Correct: Your answer is correct. frames

    Use the video frame counters to determine the number of frames it takes for the train to pass the right-most edge of the green support post on the left side of the loop.
    Correct: Your answer is correct. frames

  • Analysis

    Note: we can neglect gravitational potential energy in the following analysis, since the two points are at the same height.

    Calculate the ratio of the final kinetic energy to the initial kinetic energy of the train.
    KEf
    KEi
     = Incorrect: Your answer is incorrect.


    What percent of the mechanical energy of the roller coaster is converted to thermal energy during this time?
    percent loss = Incorrect: Your answer is incorrect. %

    State whether this roller coaster is a good example of a system where using the concept of conservation of mechanical energy will yield accurate results. Explain your answer.

    This answer has not been graded yet.

Your work in question(s) will also be submitted or saved.
Viewing Saved Work Revert to Last Response
2. –/5 points BohPhysVL1 11.IL.001. My Notes
Question Part
Points
Submissions Used
1 2 3 4 5
–/1 –/1 –/1 –/1 –/1
0/50 0/50 0/50 0/50 0/50
Total
–/5
 
You will use the following video to do this lab. Use the exact values you enter to make later calculations. Include units in your answers. More information.

  • Video and Lab Information

    To view the video above, you'll need to have a Quicktime player installed on your computer. Use the controls at the bottom of the video. Use the right and left arrows to advance the video frame-by-frame.

    The videos shows a peanut M&M® candy fired out of a pneumatic cannon into a foam block attached to a cart on a low-friction track. The M&M® sticks into the foam and remains there after the collision. In this case, the speed of the M&M® is too high to measure directly from the video. Instead, we'll use measurements of the speed of the cart after the collision to determine the speed of the M&M®.
Your work in question(s) will also be submitted or saved.
Viewing Saved Work Revert to Last Response
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