PHYSICS: Funny thing about words, all this work you thought you’d been doing, was it? Work, I mean? Great intro to chapter 5! Jakin, I think you almost did move the lab station! And I think you’ll all do great with the work problems, just remember everything from the last chapter and multiply by d! [...]

PHYSICS: So why don’t things that are moving just keep moving? Here’s the intro lecture on friction. Remember a few key things. Net forces produce acceleration. You can find Ff a couple of different ways – it’ll be part of a net force equation and can be found from the coefficient of friction equation. If [...]

PHYSICS: So an object at rest can be at equilibrium, but what about an object that is moving? And how does equilibrium relate to Newton’s first law? Or Newton’s second law? And what if you don’t have balanced forces. Here’s the lecture from Wednesday on just that! Now remind me, net forces produce what?

PHYSICS: I’m really proud of you – you’re doing a great job on thinking through these problems! Good luck in studying for your test. Practice, practice practice the problems, but don’t forget the conceptual stuff. How did I shoot those eggs across the room with the broom – but not!? How’d Preston throw the egg [...]

PHYSICS: Girl on a sled coasts down a hill… Here’s the thing. You can watch me do a thousand problems (okay, maybe not a thousand – but a lot!), and it won’t help. That’s what today was about. I don’t want you to copy what I do, I want you copy why I’m doing it. [...]

PHYSICS: So an object at rest can be at equilibrium, but what about an object that is moving? And how does equilibrium relate to Newton’s first law? Or Newton’s second law? And what if you don’t have balanced forces. Here’s the lecture from Tuesday on just that! Now remind me, net forces produce what?

PHYSICS: Good job thinking through the equilibrium problems today. A couple of things that work for me – draw them first. Then go back through and separate resultants into components. If an object is in equilibrium, then there are no net forces – all the forces in the x direction balance – everything left equals [...]

PHYSICS: I’m so proud of you – you’re doing a great job on thinking through these problems! Good luck in studying for your test. Practice, practice practice the problems, but don’t forget the conceptual stuff. If you get a chance, watch the Julius Sumner Miller videos on Newton’s laws in the Vodpod below, or look [...]

PHYSICS: So would you ever jump out of a plane? Way too much craziness for me! How was net vertical force? Great job on the problems, but don’t forget things like terminal velocity and the why! And I still don’t know what’s so funny about a fish in an elevator?? flickr photo by jeroen_bennink

PHYSICS: Who knew snow skiing could be so complicated! Well friction problems on an incline anyway. Here’s the lecture/problem review from Monday on friction problems with the applied force at an angle, and friction problems on an incline. Remember, drawing the diagram is super, super important. Label all the forces, and apply the concepts you [...]