Videos tagged physics
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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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PY105 pre-class video for session 11 - a box on a ramp
In this movie, we'll just look at a box on a ramp. First, we'll go over how to draw the free-body diagram for a box that remains at rest on ramp, including talking about the coordinate system we usually use, and how to split the various forces into [...]components. Then, we'll go from there to applying Newton's second law to analyze the situation.
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PY105 pre-class video for session 10 - friction
In this video, we discuss how we incorporate friction. We use a relatively simple model of friction, which, in some cases, can be much more complicated than our model can handle. Here, we talk about kinetic friction and static friction, as well as [...]about the effect that changing the contact area has on the friction force.
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PY105 pre-class video for session 9 - projectile motion
This video covers the basics about projectile motion. In particular, we discuss what determines the maximum height reached by a projectile, what determines the time a projectile spends in the air, and what determines the range (the horizontal [...]distance traveled) of the projectile.
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PY105 pre-class video for session 8 - the independence of x and y
In this video, we discuss a very powerful idea, that motion in two dimensions can often be reduced to two independent one-dimensional motions. For example, in the absence of air resistance, the parabolic trajectory of a baseball can be separated into [...]its horizontal and vertical components, with those components being analyzed separately.
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PY105 pre-class video for session 7 - relative velocity
In this video, we cover the concept of relative velocity, which deals with objects that are moving with respect to one another, and/or moving with respect to an observer. A common example is what happens when you're driving in your car, when other [...]vehicles, trees, bridges, etc. are moving with respect to you. We first cover relative velocity in one dimension, and then extend what we learn to two dimensions.
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PY105 pre-class video for session 5 - an introduction to force
In this video, we go over force ideas. Three forces are discussed in particular - the force of gravity; the force of tension; and the normal force. We also talk about free-body diagrams for the first time. The video ends with a short discussion of [...]Newton's first and second laws of motion, which enable us to connect force to motion.
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