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Acceleration - thinking about signs
In this video, we focus on what a sign means when it is associated with the acceleration.
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PY105 pre-class video for session 24 - Torque
In this video, we introduce torque, which is the rotational equivalent of torque. We then go over three equivalent ways to calculate torque in a particular situation.
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PY106 pre-class video for session 28 - Polarized light
In this video, we discuss polarized light (specifically, linearly polarized light, which is also known as plane polarized light). We go over, generally, ways in which light can be polarized, and then we talk about how to handle situations in which [...]unpolarized light, or linearly polarized light, is incident on a polarizer. Specifically, we go over how to calculate the intensity of the light emerging from the polarizer, assuming you know the intensity of light incident on the polarizer. Finally, we wrap things up with a brief look at how reflection and scattering can produce polarized light, and what polarized sunglasses do.
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Acceleration - graphs for motion with constant acceleration
In this video, we look at motion graphs for an example of a ball we simply drop from rest from a height of 20 meters above the ground. We ignore air resistance, so the ball's acceleration is constant as it falls. We will graph the ball's acceleration [...]as a function of time, velocity as a function of time, and position as a function of time. We will also use the graphs to see the connections between the acceleration and the velocity, and between the velocity and the position.
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Acceleration - the basic definition
This video is a brief introduction to acceleration, going over the basic definition.
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PY105 pre-class video for session 15 - uniform circular motion
In this video, we start looking at uniform circular motion, which is motion in a circular path at constant speed. We derive the equation we generally use for uniform circular motion, and then we use the equation to compare two objects in various [...]situations.
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PY105 pre-class video for session 26 - Static equilibrium
In this video, we introduce static equilibrium, which is a fancy phrase for an object that remains at rest. In static equilibrium, two conditions must be met - the first is that there is no net force acting on the object, and the second is that there [...]is no net torque acting on the object. We'll look at a simple situation of an object that remains at rest, and see how we apply the equilibrium conditions to solve for the values of two unknown forces. Watch out for a typo in the torque equation on the second-last slide (this is noted in the audio narration accompanying the video), where a "-mg" term in the equation should be "-dmg" instead.
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PY106 pre-class video for session 40 - The de Broglie wavelength
In this video, we spend some more time on wave-particle duality. We have already addressed the idea that light, in some situations, exhibits a wave nature; in other scenarios, it exhibits a particle nature. Here, we discuss a similar duality [...]exhibited by things like electrons, which we usually think of as particles. In particular, we will talk about various situations in which "particles" exhibit a wave nature.
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