Day 97: The Radial Acceleration Experiment and The Real-Time Force Diagram for a block on a Ramp

Advanced Physics:

As mentioned last week, today was a data gathering day for the radial acceleration experiment. The purpose was to determine the relationship between radial acceleration and tangential velocity.  They used a single photo gate (One Gate Timing) to measure the tangential velocity and a Vernier WDSS to measure the radial acceleration.  They set it up to measure only the x-axis acceleration.  The radius was held constant, but the experiment was completed at a second radius.  Here are a few clips of the data being gathered.

Tomorrow will be all WB’ing.


General Physics:

Today we reviewed a bit about drawing force diagrams with components.  So far, we had only worked on tension forces that had components.  Today we extended this to when we have an object on an incline.  Years ago at a Phox Share meeting, Dale Basler shared a demo using the Vernier WDSS to show the force diagram for an object on an incline.  The file is set-up with animated vectors to show the gravitational force, the normal force and a tension force, but they are really the accelerations in those directions.  It is really slick and does an excellent job of showing the kids how the forces (size and magnitude) change (or not in the case of the gravitational force) as the incline is increased.  Here is a clip of it in action.