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Learn Physics Fast
(from someone who can actually explain it)
Chris is a Stanford-educated tutor with over 10 years experience tutoring Physics to students of all abilities, from students struggling to get from a C to a B, to go-getters trying to move an A- up to an A, to struggling students just hoping to pass. In that time he got a lot of experience learning how to explain this stuff in a way it actually makes sense to normal people. Through his videos he has helped countless students, and he can do the same for you.
Warning: This is not a full course! This is a collection of physics topics gathered from other courses on the site such as trig, calculus, and chemistry. Chris plans to produce a full physics class in the future, but for now what you see below covers only 20% or so of a typical college or high school physics class.
This chapter covers the basics of scientific notation, both converting it to regular numbers and back again. Decimals, huge numbers, multiplying scientific notation numbers together, positive exponents, negative exponents, "base 10", etc. it's all covered.
Reference frames are your easiest way to do better in physics (and get some partial credit along the way), so this video introduces what they are and shows you how to draw them in for several types of common kinematics problems.
DO NOT skip this chapter unless you are the A+ student in your physics class (every class has one). You'll find lots of videos on how to do "one dimensional" motion problems (either things going straight up and down or straight sideways), and there are also lots of "equation free" videos to help you get used to the concepts, to get you used to the units of acceleration that seem to trip everyone up, to introduce the formulas, and to show you how to work easier problems in your head so that you're less likely to get lost plugging and chugging. The more advanced videos in this chapter get into the formulas also shows you how to do the most common vertical and horizontal kinematics problems: objects dropped off buildings; objects thrown vertically up or down off a building; cars and buses accelerating down the road.
These videos cover graphs of acceleration, velocity and position in a similar way to how your calculus professor made you sketch the derivative of a function. The key takeaways are that you can use the slope of a curve to sketch its derivative, or you can use the "area under the curve" to plot its integral.
This chapter covers how to do everything you need to do with vectors in physics, but especially the stuff you do constantly: breaking force and velocity vectors into their X & Y components, combining vector components back into a "resultant vector", and combining multiple vectors into one (like to find the net force vector) by breaking each into its components.
This chapter covers kinematic ramp problems WITHOUT friction or forces, and most importantly, it explains how to draw those dang triangles for ramp problems, where you have to break g into its X and Y components. Problem types covered are kinematic setups like: A skier heads down a 20° slope, how fast is she going after 30m; or, A box slides down a 15° ramp, how long does it take to reach the bottom? If you're using F=ma to solve all kinds of free body diagram situations on ramps, then look for the ramps videos further down.
Your class might not cover this, so make sure you have to know this before watching these videos, because this is an annoying topic. Basically it's 2-D kinematics, kind of like you would find in the projectiles chapter, except EVERYTHING is a vector with i's and j's in it, and EVERYTHING is pointlessly confusing! It's like your prof and book went out of their way to make 2-D motion as obscure and abstract as possible. Makes you wonder if they're out to get you. (Before this chapter, I would have said they aren't, but after this chapter, I'm not sure...)