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Flipping Physics
Fixing My 25-Year Physics Mistake
After 25 years of teaching physics, I realized I had been wrong about when you can use the equation Work due to nonconservative forces = Change in mechanical energy. In this video, I break down my mistake, show the correct way to think...
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AP Physics 1 Unit 3 Review: Work, Energy, and Power
In this video, we cover the key concepts from Unit 3 of AP Physics 1: Work, Energy, and Power. We explore how kinetic energy is calculated, the work done by constant and conservative forces, and delve into potential energies, including...
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Physics Review of Mechanical Energy, Work-Energy Principle, and Power
This section of the review covers mechanical energy, the Work-Energy Principle, and power. Mechanical energy is the sum of a system's kinetic, gravitational potential, and elastic potential energies. In this review, we emphasize how...
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Energy Transferred Into and Out of a System
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Finding angular velocity of a rotating bar using energy methods about center of mass - Method 2
The bar is purely rotating about the pin support. However, we can view this phenomenon as simultaneously rotating about the center of mass while the center of mass is moving in a circular path. This means we have to include both the...
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Derivation of Pendulum equations method 3
Derivation of Pendulum equations method 3
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mechanical energy example problem part 1
What is the velocity of the black just BEFORE it hits the spring? Notice that the 2 non conservative forces are your normal force and your friction force.<br/>
i) 2.56m/s
ii)0.0989m
i) 2.56m/s
ii)0.0989m
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Complicated dynamics problem using energy methods
Here we solve for the velocity of a disk as it's rolling up a circular hill using energy methods 1) Find work done by external forces (it's 0). 2) Notice there is rotation so the kinetic energy is 0.5 m (v2^2 - v1^2) + 0.5 I (w2^2 -...
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Example of Energy Transferred Into and Out of a System
Example: A 7.50 kg block on a level surface is acted upon by a force applied of 35.0 N at an angle of 25.0° below +x axis. The block starts at rest, the coefficient of kinetic friction between the block and surface is 0.245, and the...
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Mechanical Energy example spring compression
This video covers a basic example which involves the work energy equation.
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Finding angular velocity of a rotating bar
What is the angular velocity of a bar when it falls to the vertical position after being released from rest? You can attempt this problem a number of different ways. And to demonstrate this, I've created 3 different solutions to this...