Posted by: Mitchell Coverstone to Sciences » AP Physics » Videos » FBDs and Other Force Related Stuff
Score: 52Starina says: I enjoyed how this video was reminiscent of Coco's video with the cut-out information, although I don't think it was necessary to understand the scenario at hand. I also appreciated the accurate free-body diagram that clearly showed the force vectors, and their components, that were acting on the object. Lastly, the connection between the FBD and Newton's Second Law was clear, but the calculations were a little squished towards the bottom of the paper.
Jeremy Seloff says: I liked this video, Mitchell. I thought the cut outs were a cool way to do this instead of you writing everything. The set up of the FBD was very clear and thorough, which was useful in doing the calculations and seeing all the forces at work. However, I believe the force down the ramp would be mgsin(x) instead of cosine and the force into the ramp would be mgcos(x) Other than that, it was great and informative. #kinglear
Marco Gutierrez says: Hey Mitchell. So I did like your video a lot. The cut-outs made following the problem much easier as we didn't have to follow every single thing you wrote. The FBD, however, was a little confusing. I might be wrong, but I feel like it's strange to draw the normal force before showing the component forces of mg. The calculations were very clear, but how do you determine which components are sine and which cosine? Congrats on you varsity letter!!!
Benjamin Liske says: I will reiterate what Jeremy said in that this calculation is incorrect due to your mistake of setting the normal force equal to the TOTAL force of gravity. Otherwise, however, I appreciate the clarity of your expression and the soothing sound of your voice filling my ears.