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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...)
This chapter covers every type of projectile motion problem that your physics prof (or pre-calc prof, for that matter) could throw at you. We'll start things off with the Range Equation, which can only be used for flat-field problems where the projectile lands at the same level it was launched from. Then we'll get into the various types of problems that have different levels, from projectiles shot upwards at castles to arrows shot down from castles onto fields below. And we'll wrap up with several videos on very specific types of harder problems you're likely to see, such as projectiles dropped from airplanes, calculating max height of a projectile, and that one where an arrow is launched at an object falling through the air.
These videos cover the most basic circular motion problems, the ones you get BEFORE your class does forces, Newton's Laws (F=ma), etc. In these videos we're just covering basic centripetal (and centrifugal) acceleration problems, including situations like satellites orbiting a planet, or a roller coaster going over the top of a hill. A later chapter of videos in the Forces section will cover advanced circular motion and F=ma problems.
This chapter covers all of the basic vocab and concepts that you could need for multiple choice and short answer questions about forces. Lots of vocab and intro to forces you should know: Tension, Springs (Hooke's Law), Weight (gravity), Normal Force, and Friction. Also covered are the difference between mass and weight, and contact and field forces.
This chapter covers everything you could need to know about free body diagrams, starting with why the heck the darned things are called free body diagrams to begin with. Then each video shows you how to do the free body diagram for a common type of problem, from sliding boxes to inclined ramps and pulley systems.
This chapter covers the word problems that the Forces chapter in physics class usually starts with. Given acceleration and mass, you may be asked to solve for net force, or given a bunch of different forces, you might need to find the net force (by combining the vectors into a single vector using vector components). Also covered are a favorite physics problem type: calculate the weight of something on the moon.
The videos in this chapter cover word problems about elevators, specifically the ones where they tell you how fast the elevator is accelerating up or down and then ask you how much the scale under the passenger would say the person weighs. Examples covered:
This chapter covers detailed examples of ramp problems involving forces, where you have to: 1) create the free body diagram and not leave out anything; 2) work out your F=ma equations in X and Y; and 3) solve the equations using substitution. Examples covered:
The videos in this chapter cover one of the most difficult and time-consuming type of physics force problems that you'll come across: a force pushes or pulls two or three objects that are contacting each other, and you're supposed to find the force between them. Examples covered: