Videos tagged py105
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PY105 pre-class video for session 29 - Angular momentum
In this video, we introduce the concept of angular momentum. There are many parallels between linear momentum and angular momentum, so we apply what we know about linear momentum to angular momentum. We also discuss a spinning figure skater, which is [...]a common example of a system in which angular momentum is conserved (at least for a short time), and we talk about how to convert a linear momentum into an angular momentum.
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PY105 pre-class video for session 27 - Newton's second law for rotation
In this video, we introduce Newton's second law for rotation, which is the fact that the vector sum of all the torques acting on an object is the rotational inertia of the object multiplied by the object's angular acceleration. Newton's second law [...]for rotation is the rotational equivalent of Newton's second law, that the vector sum of the forces acting on an object equals the mas multiplied by the acceleration.
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PY105 pre-class video for session 28 - rolling
In this video, we'll talk about four issues that relate to rolling, specifically to rolling without slipping. Among these, we'll cover how rolling motion can be looked at as the superposition of pure translation and pure rotation; how to find the [...]net instantaneous velocity of any point on a rolling object; and what the shape of the path is for a single point on the edge of a rolling object.
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PY105 pre-class video for session 21 - power, and energy vs. force
In this video, we define the concept of power, which is a measure of the rate at which work is done. We also spend some time comparing our two main approaches for solving problems, either by applying energy conservation ideas or by analyzing forces [...]to find acceleration, and using that acceleration in the constant acceleration equations.
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PY105 pre-class video for session 22 - combining momentum and energy
In this video, we complete our first look at the conservation laws, examining situations in which both momentum conservation and energy conservation can be applied (although not necessarily applied at the same time). The video starts with a review of [...]how we classify collisions, and then goes through an analysis of a classic demonstration, dropping a baseball (although a tennis ball is safer!) on top of a basketball.
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PY105 pre-class video for session 20 - energy conservation
In this video, we'll introduce a very important idea - the idea of energy conservation. The law of conservation of energy is a thread that will run throughout the rest of this course, and on to second-semester physics, too. We'll look at how we apply [...]energy conservation, and we'll use energy conservation to analyze a particular example.
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PY105 pre-class video for session 19 - Work and Energy
In this video, we will start talking about the concept of work, which is related to kinetic energy in much the same way that impulse is related to momentum. Work done by the net force is equal to the change in kinetic energy, while the impulse [...]associated with the net force is equal to the change in momentum. It's a little more complicated than that, because work and energy are scalar quantities, while momentum and impulse are vectors, which leads to some important differences in how we handle them. Toward the end of the video, we'll also talk about potential energy.
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PY105 pre-class video for session 18 - center of mass
In this video, we'll discuss the concept of the center of mass. We'll talk about how to calculate the position of the center of mass, and then talk about why the center of mass is a powerful concept. We will also talk about the velocity of the center [...]of mass, and talk about how the center of mass is connected to momentum conservation. Finally, we'll look at the interesting behavior of the center of mass during a collision.
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PY105 pre-class video for session 17 - momentum and impulse
In this video, we'll start talking about momentum and impulse. We'll see how momentum fits in with what we have done previously, and we'll talk about a law of conservation for the first time. We'll also talk about impulse, which is another name for [...]the change in momentum.
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