You can find circular motion everywhere, including football, car racing, ice skating, and baseball. An ice skater spins on ice, or a competition speed skater makes a turn… they are both examples of circular motion. A turn happens when there’s a force component directed inward from the circular path. Let me show you a couple of examples:
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When the sum of the forces equals zero, then the object is not accelerating (the object is either not moving in that direction, or it is at a constant acceleration). You need to do this separately for each direction, x and y separately,
It looks like I made a mistake in the video, so sorry about that! When I am summing the forces in the x-direction, I accidentally wrote “Fy=may” where I should have written “Fx=max“
You say at 3:13 that the sum of the forces in the y direction was equal to 0. Then at 3:22 you say that the sum of the forces in the y direction are equal to the mass times the acceleration in the y direction. Did you mean the x direction? Or is there something else I’m missing?