FizziksGuy

Space is extremely interesting... and not nearly as empty as we sometimes think! Welcome to physics Patrick.

Thrilled to have you aboard Jake... perhaps we can take a look at physics in lacrosse, hockey, and skiing this year!

A future English professor... and a musician... and an artist... talk about a Renaissance woman!!!

Wow, you made me pull out my dictionary!

Hope there are tons more "ding" moments... In preparing Monday's class, I had one myself! (And still have them regularly). You never really know physics, you just slowly get better at it...

I hope you have fun and learn things too! Physics-y and non-physics-y things!

Wow, tremendous! This look like a great opportunity for a podcast episode exploration!!!

Tons of physics in radio broadcasting too!!! :saturn:

That's an awesome dream, Joshua, and I'm thrilled to have an opportunity to help you (at least a little bit) along your path!

I hope you learn a lot in physics too! :egg):einstein)

Pleased to make your acquaintance Jay. We'll have to hook you up with Mr. Ditty -- also a ski racer. Perhaps we should look at a podcast segment on the physics of Nordic skiing?

What's your favorite COD game? Tons of physics in video games, too, and a great demand for programmers who know physics in order to realistically model what's happening in video games. We could do a podcast segment on physics of Call of Duty if you're interested...

And there's TONS of physics in medicine. MRIs I find especially amazing!

I agree... I'm jealous! Perhaps we should explore some physics of horseback riding?

Thrilled to have you aboard, as151701. Another of our new users, Mr Ditty, is quite the nordic skier!

Hi chichi! Yes, I can answer that. Answers to the worksheets under Regents and Honors physics are now available on the site (by popular request) as part of the book "" A PDF download version is available here, or you can find it on Amazon.com! Make it a great day, Dan

When I work through this I get a different answer... you can find a web tutorial on ramps as well as a video tutorial on ramps on the main APlusPhysics website or through the links above for more information. To dive into your specifics, however: First, draw a diagram of the situation. [ATTACH=CONFIG]435[/ATTACH] The, draw the free body diagram and then the pseudo-free body diagram. When I do this, along the x-axis I see an applied force going up the ramp, and the force of friction as well as the horizontal component of the object's weight down the ramp (mgsinΘ). Along the y-axis you have the normal force up, and the vertical component of the object's weight down the y-axis (mg*cosΘ). [ATTACH=CONFIG]436[/ATTACH][ATTACH=CONFIG]437[/ATTACH] Then, you can use Newton's 2nd Law in the x- direction to solve for the frictional force. Note that if the body is JUST at the point of moving up the plane, the acceleration of the object is just barely at zero, so the net force in the x-direction must be zero. Next, we'll use Newton's 2nd Law in the y- direction to solve for the normal force. Finally, we can solve for the coefficient of friction. So, a slightly different answer compared to the one you provided. Note that I estimated g as 10 m/s2 as opposed to 9.8 m/s2 on the surface of Earth. Hope this helps!

Not quite. For part B, Boy 1, for example: Then, with vi known, solve for d.

I think you're on the right track, but I'm a touch confused on boy 1... d for boy 1 in the first part is 7.5 m, not 5m, correct? So that first equation should be: 7.5m=5*t+0 ==> t=1.5s For part B, you don't know how high they go, but you do know their time in the air, so for boy A: vi=? vf=0 d=? a=-9.8 t=1.5s/2 = 0.75 Solve for d using kinematic equations. Boy 2 would then be similarly solved. The big trick here -- labeling all your given information as horizontal or vertical motion, and keeping them separate. The only thing that correlates between the two is the time. :-)

A car is travelling on the highway at a constant speed of 24 m/s. The driver misses the posted speed limit sign for a small town she is passing through. The police car accelerates from rest at 2.1m/s^2. From the time the speeder passes the police car : A) How long will it take the police car to catch up to the speeder? What distance will the car travel in that time? Car 1 : Car 2: v_i=24 m/s v_i=0 a=2.1m/s^2 d=vt d=0.5at^2 vt=0.5at^2 2vt=at^2 2(24)t=2.1t^2 48t=2.1t^2 divide both sides by 2.1t A) 22.9s=t d=vt=24 m/s * 22.9s = 549m

A couple ways you can do this, but my favorite would be to call the position of cyclist A X1, and the position of cyclist B x2. Position can be written as x=x0 (initial position) + velocity * time, or x=x0+vt X1, then, could be written as: X1=0+(20km/h)t X2, similarly, is: X2=20-(15km/h)t You want to know the time when X1=X2, so set them equal, and solve for t: (20km/h)t=20-(15km/h)t Good luck!

Thanks for the feedback faizan1041, I very much appreciate your kind words! Videos of work, energy, and power should be available currently (see links attached). Thermodynamics, fluids, rotational motion, and enhanced optics are all on my "to-do" list for next year as time allows. In the meantime, there is a chapter on thermodynamics in the Honors Physics Essentials book, and I am working on the online tutorials for thermo. Make it a great day!

[ATTACH=CONFIG]433[/ATTACH]I'm thrilled to announce that Physics: Fundamentals and Problem Solving has been released for the iPad today. This book, which is for the iPad only, is an algebra-based physics book featuring hundreds of worked-out problems, video mini-lessons, and other interactive elements designed for the introductory physics student. Topics covered include vectors and scalars, kinematics, dynamics, momentum, circular motion, gravity, rotational motion, work, energy, power, fluids, thermal physics, electrostatics, circuits, magnetism, microelectronics, waves, sound, optics, and selected topics in modern physics. Physics: Fundamentals and Problem Solving is integrated with the APlusPhysics.com website, which features free online discussion and help forums, student and educator blogs, interactive quizzes, thousands of supplemental problems, and even a student-created physics wiki. The book requires an iPad and the iBooks 2 application. The non-interactive version, known as Honors Physics Essentials, is available for other iOS devices through the iBooks store; for the Kindle and other devices running the Kindle App through the Kindle Store; for the Nook through the Barnes and Noble Nook Store; and in hard copy format from Amazon.com as well as Barnes and Noble.

I’m thrilled to announce that Physics: Fundamentals and Problem Solving has been released for the iPad today. This book, which is for the iPad only, is an algebra-based physics book featuring hundreds of worked-out problems, video mini-lessons, and other interactive elements designed for the introductory physics student. Topics covered include vectors and scalars, kinematics, dynamics, momentum, circular motion, gravity, rotational motion, work, energy, power, fluids, thermal physics, electrostatics, circuits, magnetism, microelectronics, waves, sound, optics, and selected topics in modern physics. Physics: Fundamentals and Problem Solving is integrated with the APlusPhysics.com website, which features free online discussion and help forums, student and educator blogs, interactive quizzes, thousands of supplemental problems, and even a student-created physics wiki. The book requires an iPad and the iBooks 2 application. The non-interactive version, known as Honors Physics Essentials, is available for other iOS devices through the iBooks store; for the Kindle and other devices running the Kindle App through the Kindle Store; for the Nook through the Barnes and Noble Nook Store; and in hard copy format from Amazon.com as well as Barnes and Noble. Check out some screenshots from the book below: Source

I’m thrilled to announce that Physics: Fundamentals and Problem Solving has been released for the iPad today. This book, which is for the iPad only, is an algebra-based physics book featuring hundreds of worked-out problems, video mini-lessons, and other interactive elements designed for the introductory physics student. Topics covered include vectors and scalars, kinematics, dynamics, momentum, circular motion, gravity, rotational motion, work, energy, power, fluids, thermal physics, electrostatics, circuits, magnetism, microelectronics, waves, sound, optics, and selected topics in modern physics. Physics: Fundamentals and Problem Solving is integrated with the APlusPhysics.com website, which features free online discussion and help forums, student and educator blogs, interactive quizzes, thousands of supplemental problems, and even a student-created physics wiki. The book requires an iPad and the iBooks 2 application. The non-interactive version, known as Honors Physics Essentials, is available for other iOS devices through the iBooks store; for the Kindle and other devices running the Kindle App through the Kindle Store; for the Nook through the Barnes and Noble Nook Store; and in hard copy format from Amazon.com as well as Barnes and Noble. Check out some screenshots from the book below: http://aplusphysics.com/flux/wp-content/uploads/2012/06/photo-copy-9-150x150.pnghttp://aplusphysics.com/flux/wp-content/uploads/2012/06/photo-copy-3-150x150.pnghttp://feeds.feedburner.com/~r/PhysicsInFlux/~4/GV_sPDGouVs Source