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Hello, I think the solution for the part b has some problem. To calculate the new center of mass, the boy's new position should not be 4.24m as shown in the solution. While the boy walks across the raft, the raft is also moving. The other corner already shift towards the left. I believe the final position of the boy relative to the raft's center should be (x + 2.12) m. Using this in the CM calculation, x = -0.424 m. So the raft moved 2.544m in the direction opposite the boys's displacement. Thanks for your attention.

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Love this post, especially with a daughter who is exploring biomedical engineering! Can't wait to tell her about your reflections over dinner this evening.

Hello all, I've been seeing some action films recently and noticed how frequently explosions are utilized in dramatic sequences. Although I like the excitement, I've been wondering about the physics involved in these explosions. In most films, we witness huge explosions with cars or buildings disintegrating, but I wonder how realistic these depictions actually are. For example, in movies like The Dark Knight or Fast & Furious, the explosions are often huge and result in large shockwaves and flying debris. However, in reality, how much of that would actually happen? I’m aware that explosions in movies are often exaggerated for visual impact, but how much of that exaggerated physics still aligns with real-world laws, like the conservation of energy and the way pressure waves travel? I came this website:https://aplusphysics.com/comm unity/index.php?/topic/12766-alteryx-course-understanding-the-physics-behind-the-gravity-movie-scene/&do=findComment&comment=15788 and still excited to know behind the scenes of Physics of Explosions in Movies. I’d love to hear your thoughts on this. Are there any movies you’ve seen that got explosion physics right, or at least got close? Any resources or articles that dive into this would be great too! Looking forward to the discussion! Cheers, azizi

Haha, I completely understand you! You're like, "I'm done with physics after high school," and then boom, college comes and it's everywhere. Particularly in BME (Biomedical Engineering), right? It's like physics is hiding in every nook and cranny, even if you're working with cells or prosthetics instead of rockets. And being the "resident physics person" in your group? Classic move you're like the physics superhero when you're the one who actually understands how things work. And then AP Physics C was a monster (I recall struggling through that one too). That entire "oh, it's just a B in high school" mentality—then you're working on rotations, oscillations, and lord knows what else in lab, and you're like, this is still most definitely physics. You can't really shake physics once you've had it ingrained into your head, no matter if it doesn't at first glance have to do with your major. So, so physics tends to hang on you know, even though you tried locking it out back there somewhere. Good job: welcome to the club!

SimuLAB: Circular Motion is an interactive simulation laboratory where students can learn the fundamental principles of circular motion, including angular velocity, tangential velocity, centripetal acceleration, and centripetal force. Students can manipulate parameters such as the mass of the object, speed, and radius of the circular trajectory to see how they affect the motion. The simulation offers instantaneous feedback in the form of graphical representations, which enable students to see the interaction between the variables and reinforce their knowledge of how forces influence objects that are traveling in a circle. Students can explore the impact of variations in speed or radius on centripetal force and acceleration by changing settings, which enhances their understanding of the concepts of circular motion. The lab's hands-on approach is an interactive method for students to relate theory and practice and grasp the motion dynamics in a circular motion better.

Great question, and a very fun one. As a high school physics teacher my students and I had a great time analyzing video clips from action movies to determine the level of realism in the captured scene... and much of that can be done with pretty straightforward algebra-based kinematics (making a few assumptions, of course). There are a number of fun books that do the same. A quick search of "movie physics" on Amazon will pop up a few to potentially get you started!

Hello everyone, I’m really interested in the way physics is used in movies, particularly in the special effects (SFX) we see on screen. I’ve been watching a lot of action movies lately, and while some of the stunts and explosions look incredible, I often wonder how realistic they are. For example, in films like Avengers or Mad Max, explosions seem to happen almost in slow motion, and characters sometimes survive things that would be impossible in real life. I’d love to know more about how filmmakers use actual physics in these scenes. How do they make explosions and crashes look so real? Do they use real science to simulate what would happen in the real world, or is it more about creating the illusion? Also, how accurate are the representations of things like gravity, motion, and impact forces in action-packed sequences? Are there any common myths or misconceptions in movie physics that we should know about? Looking forward to hearing your thoughts and learning more about the science behind movie magic! Thanks!

It has been done. Yes, the chain goes slack as gravity slows you down. The last part of your trajectory is parabolic, not circular, and you don’t clear the bar by a lot. Yes, it’s dangerous.

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View File 11 Tips to Better Physics A motivational and practical guide featuring 11 essential tips to master physics for AP Physics students. Covers strategies like consistent effort, visualization, derivations, and disciplined practice, alongside curated resources to build deep conceptual understanding and exam confidence Submitter Vish Submitted 03/26/2025 Category APlusPhysics Guides  

THE FOUNDATION OF SUCCESS Every great achievement starts with a simple decision: the decision to begin and to stay with it no matter how tough the journey feels. So, first of all, remind yourself every day: success demands unwavering consistency. . Physics may feel overwhelming at times, but with persistence, no challenge is insurmountable. Embrace the process of learning, because every small effort you put in now, builds towards something greater. Reflect on your goals and commit to making progress one step at a time. Great achievements begin with accepting the challenge ahead—you have the potential to conquer it DOUBT 11 Tips (English) LS.pdf