Videos: |

Paper Towel Roll Dropped Onto a Bathroom Scale |

In this video, a 1.0 kg roll of paper towels is dropped from a height of 0.5 meters onto a bathroom scale. The needle on the scale shows the reading in pounds (force) every 0.001 seconds as the paper towel roll slows to a stop.

When doing calculations, please note that the collision was not perfectly inelastic. The paper towel roll did bounce back up slightly upon impact.

The app for this video has a simplified interface without automated plotting or graphical analysis tools.

**Computing Change in Momentum:**

- Assuming the paper towel roll hits the scale at a speed of 3.1 meters/second, what is its initial momentum before the collision?
- Assuming the paper towel roll comes to rest, what is its final momentum after the collision?
- What is the magnitude of the change in momentum for the paper towel roll?

**Computing Impulse:**

- Create a data table of force for every 0.001 seconds of video time. Be sure to convert the force to Newtons!
- Compute the impulse on the paper towel roll from the scale every 0.001 seconds.
- What is the total impulse on the paper towel roll from the scale?

**Does the total impulse on the paper towel roll match the change in momentum of the paper towel roll? Why or why not?**

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