# Physics 9-24-13 Angular Projectile Problems

PHYSICS – Great job today working through the monkey-hunter problem! So what happened with the last one that we worked? Was the book wrong or were we wrong? Why? Watch our discussion again and see what you can come up with. Bring me an answer tomorrow!

Don’t give up on them tonight! They are tough, but you can do it!

flickr photo by Johnson Cameraface

# Physics 9-20-13 Horizontal Projectile Motion

PHYSICS – Great job today, and applying stuff from the last chapter no less! Here’s the lecture from Friday on horizontal projectile motion. Just go slow and easy and you’ll master it in no time flat. Watch out for squirrels throwing nuts!

flickr photo by RunnerJenny

# Physics Test on Chapter 3, 2-D Motion

PHYSICS: So you ready for that test tomorrow? Since the help session isn’t until tomorrow morning, I thought I’d go ahead and post a couple of old reviews on the homework and worksheet problems (2 different vodcasts from last year). Don’t forget what you should do to start – Draw a picture, write what you know, resolve the resultant velocity into vertical and horizontal if you need to, and find formulas that fit (because it will hardly ever be solved with just one) and go for it!!

If you are talking angular projectiles, the resultant velocity is actually made up of two things – horizontal velocity and vertical velocity. The horizontal velocity never changes, the vertical velocity has a different direction going up and coming down, but it has the same speed at equal levels. If you’re talking horizontal projectiles, the resultant velocity is the same as the horizontal velocity of the gun, because that’s the only kind of initial velocity it has! Relative motion is even easier – just use the Pythagorean theorem and tangent, and use horizontal to find horizontal and vertical to find vertical. Good luck!!

flickr photo by Felipe Skroski

flickr photo by f-l-e-x