The Official AP Physics B Thread

Test Preparation AP Test Preparation
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<h1>3. The net force is the component of force parallel to the ramp. We don’t know the angle of inclination, but we know the height and length of the ramp, which is 10m and 20m respectively. The force is mgsin(theta) and we know sin(theta)=opposite/hypotenuse, so F=(2kg)(10kg(m/s^2))(10m/20m)=20(.5)= 10 N or E.</h1>

<h1>8. C because temperature is a measure of average kinetic energy, and if temperature is constant, than the average kinetic energy is constant, so the change in internal energy is 0 or not changed (C).</h1>

<h1>16 Got it wrong, need help with that</h1>

<h1>18. The photon loses kinetic energy due to the collision and since kinetic energy is proportional to frequency, the photon will have a smaller frequency.</h1>

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<p>Can someone expain #12, if the capacitor is fully charge shouldn’t the voltage across it be equal to the voltage of the battery, 12 V</p>

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<p>^ never mind, I didn’t include the voltage drop across the resistors.</p>

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<p>@mordred how did you get the 2009 mc?? ive been looking for it forever!! help me out?</p>

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<p>For #16, the only information you need from what they give you is the index of refraction, n. n = c/v where c is the speed of light in a vacuum and v is the speed of light in a given medium, so rearrange the equation for v: v = c/n –> v = 3x10^8 / 1.5 = 2x10^8.</p>

<p>Gah, I’m really weak experimentally though. For #2 on the FR portion, how can you determine the acceleration and constant velocity portions of the 100m dash without more advanced technology like computer analysis systems? We only ever analyzed motion in class using motion detectors hooked up to computer programs.</p>

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<p>^ here’s the solution to that problem (not that i would have ever thought of this on the actual exam, gahhh) -
<a href=“College Board - SAT, AP, College Search and Admission Tools”>College Board - SAT, AP, College Search and Admission Tools;

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<p>What is the format of the AP Physics B exam?</p>

<p>70 Multiple Choice Questions (no calculator)</p>

<p>(6, 7, or 8) Free Response Questions (all calculator?)</p>

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<p>Can someone explain frq number 5 parts d and e?<br>
<a href=“Supporting Students from Day One to Exam Day – AP Central | College Board”>Supporting Students from Day One to Exam Day – AP Central | College Board;

<p>I didn’t understand the solution in the answer key.</p>

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<p>So, I am wondering if it would be possible to take AP physics B in my sophomore year? I am planning on taking basic physics over the summer, and doing Algebra 2/Trig Honors once school starts. I heard AP physics B wasn’t math based, but would I be ready for it? (By the way my same teacher who teaches algebra, also teaches AP physics)</p>

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<p>hey guys i have a question i do not take ap physics , i take honors physics but i am taking the ap exam , the formulas i learned are not the same as the ap formulas but i arrive the same answer and they mean the same thing , it just isnt written the same and witht the same letters , if i use my formulas on the ap exam , will i get points taken off ?</p>

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<p>Does anyone have the 2009 AP physics B multiple choice exam?</p>

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<p>Does anybody have ANY released multiple choice? Please and thank you!</p>

<p>@raymanpie, Alg.2/Trig is more than enough for the AP physics test. Make sure you selfstudy a lot of the Alg.2/Trig over the summer, especially the unit circle/ basic sine/cosine values. Make sure you have a good grip on manipulating equations.</p>

<p>I’m a sophomore self-studying AP Physics B. I started over the summer, then I neglected it for many many months, and now I am panicking because I’ve forgotten lots of it. You have a teacher, you won’t have the same problem. You can prepare easily.</p>

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<p>Physics B is all algebra and trig-based. If you do not have a solid foundation in math, it would make the class much harder to take.</p>

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<p>Here’s the released 2004 exam:
<a href=“http://salemhighschoolphysics.files.■■■■■■■■■■■■■/2011/04/ap_physics_2004.pdf[/url]”>http://salemhighschoolphysics.files.■■■■■■■■■■■■■/2011/04/ap_physics_2004.pdf&lt;/a&gt;&lt;/p&gt;

<p>I can’t find the 2009 exam, but all the FRQs are released on College Board.</p>

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<p>someone really needs to get this forum back up!</p>

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<p>How much do we need to know about fluids??</p>

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<p>any hope of getting a 4 without knowing electricity and magnetism?</p>

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<p>Here are all the released tests (1984, 1988, 1993, 1998, 2004, 2008). Just don’t have 2009. If someone has it please post a link here.</p>

<p>[ACHROMATIC</a> COMPUTING | file index](<a href=“http://files.achromaticcomputing.com/ap_physics/misc/]ACHROMATIC”>http://files.achromaticcomputing.com/ap_physics/misc/)</p>

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<p>oh wow kiwiasian that’s pretty awesome that you have all those practice tests, thanks.</p>

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<p>density (p) = m/v
specific gravity = p of substance/p of water
pressure = fa
hydrostatic pressure or gauge pressure is = pgh
absolute pressure = pressure of atmosphere + pgh
buoyant force/archimedes’ principle states “the strength of the buoyant force on an object is equal the weight of the displaced fluid by that object” which is = (p of liquid)(vol of object)(g)
Av(initial)=Av(final)—A is the cross sectional area of the tube while v is the speed of the fluid.
Bernoulli’s equation = (p of atmosphere) + pgy + 1/2pv^2 = constant
Torricelli’s equation = v =square root of (2gh)
Bernoulli/Venturi effect states “the pressure is lower where the speed is a greater”
*REMEMBER: the equations of fluids are basically synonymous to those of mechanical energies, except with different variables.</p>