Just remember guys F=ma and V=IR. If you can remember that, your pretty much set to get at least a 1. :-*
@pittster i dont think you can get less than a 1 
@icandothis45 - This one is pretty long, so I’ll try to explain it in steps: (mE = mass of Earth, rE = radius of Earth, etc.)
- Density is massvolume, so the mass of the planet is (2/3)(pE)(4/3)(pi)(2rE)^3.
- You know g=9.8m/s^2 on Earth; use the equation on the reference sheet to get 9.8=G*mE/rE^2. The mass of the planet is the density of the planet, pE, times the volume of the planet, (4/3)(pi)(rE)^3. The rE^2 cancels out, leaving you with only rE in the numerator.
- You're solving for g on the planet. g=G*mass of planet/radius of planet^2. Substitute the entire thing from step 1 for mass, substitute 2rE for radius. If you're doing this on paper, you'll realize that (2rE)^2 cancels out, leaving you with only 2rE in the numerator.
- Cleaning up the equation in step 3, you should have g=G(2/3)(4/3)pipE2rE. From the equation in step 2, you have 9.8=GpE(4/3)pi*rE. Replace the variables in the equation ^ with 9.8.
- Once you do that, you're left with 9.82(2/3), giving you 13 N/kg.
Just a lot of really annoying algebra.
@glasshours I hated that problem lol
@Celcel Sure.
@Mathman97 Hb a 3? I wonder how difficult this will be even getting a 3. It’s like the course was a whole waste. I practice doing something all year just so that I can be screwed over on an all conceptual exam like the one we took
@SimpleBio i feel the exact same way, i think i heard a 3 is about 40%
I’m pretty sure I’ll break the record of lowest score literally ever
For those of you talking about rulers, what do we need a ruler for…?
Rulers would be useful in making the line of best fit. @CeLcel is that for the 2014 mc?
@HiDanny no, it’s the new physics 1 MC
edit: unless the practice questions came out in 2014 or something, idk. But otherwise, its for 2015 physics 1
Im not sure about MC number 1 on the practice exam ( I got it wrong when we took it in class and I did not see why)
Why wouldn’t B show a force that changes kinetic energy and changes direction?
@AlphaDragon - It doesn’t change the direction at “the instant shown”; the force only slows the object down. I wrote a pretty long description a few pages back, if you want to try to find it
In my class we did a lot of math and minimal concepts, but it is easy to use the math to understand/explain the concepts. You can do the math to test the concept and then just explain it in words
could someone explain photogate for me please
Anyone have any idea about the curve for a 5? 50% seems awfully low to me…
@CS107A I am pretty sure that you have to actually explain how to use the data and list everything out step by step. Just saying use “this program” and “that program” will most likely not get you anywhere as the CollegeBoard won’t actually be doing that when they are grading your papers.
@Mathman97 - You do realize that a simple Google search will tell you what a photogate is, right
For a lab, you can calculate the velocity/acceleration of a glider by passing it through two photogates and getting the time it takes to travel the distance between the two gates.
@tommyeventing I’m pretty sure its suppose to be around 75%. I’m not sure where people are getting 50% from.
@glasshours , lol i know, i figured id actually understand it when i read it on here tho