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Frictional force is always opposite of applied force because friction of the surfaces of objects works to prevent objects from sliding past on another. This in essence then is working to prevent the movement of the ball to the right, meaning it applies the force to the left. If the ball was being pushed to the left, the fractional force would then be drawn to the right. It is always opposite. I hope that helps!
In 6:35, as I have understood, the arrow pointing towards the “chromosome” should be a chromatid, right? I have been having some trouble understanding the terminology but with pictures in the internet I think I shouldn’t be wrong. If I am I apologise.
No worries! I appreciate the question and would like to help. If you are talking about the dark blue arrow on the left, labelled with "chromosome" in the middle of it, that is in fact pointing to a chromosome. Individual chromosomes for humans exist in homologous pairs, which are the two chromosomes on the left. During the cell cycle DNA is replicated and each chromosome then creates a copy which is called a chromatid, as pictured on the right. I hope that helps! If you have other questions please let me know.
Thank you for pointing out this mistake, you are correct! I am going to pin this comment to the top so that others can see it. If there are any other inconsistencies please let us know!
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Sure thing! Lung cancer is uncontrolled cell growth in the lungs, while emphysema is damage to the air sacs of the lungs. Both are often caused by smoking. I hope that helps!
I understand what you mean. In that image there is some directionality to how the chromosomes are sitting, looking like they are along a metaphase pate (shown in a slight vertical orientation). I think it would be fine to call that metaphase or prometaphase. It does not help that no spindle fibers are visible... I apologize if the image is a bit confusing because some of the information needed is not present.
Hello, I love ur videos they are really helpful. I just have a question: in the textbook, it tells us about the history of the model of the atom (eg. Dalton and Plum pudding model) but do we need to know those? Or do we just need to know about the subatomic particles and their relative charge/mass and etc? Anyways, I love ur videos and I wanted to say that it helps me so much for my studies!
Happy to help! There is nothing in the 1.2 curriculum that specifically mentions those models. They are great to reference, though the names and concepts of them should not show up on the exam because they are not mentioned within the standards for the course. I hope that helps!
Correct, this covers the objectives that both SL and HL students need to learn. If you are an HL student and there are HL only objectives within the section there will be another video covering those, so be sure to watch that one as well!
