I need some really good questions

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The discussion focuses on finding high-quality questions related to forces and motion. A user seeks recommendations for resources that provide challenging questions without the need to wait for a specific book. The Feynman Lectures website is mentioned as a valuable source for such questions. Additionally, a reference to a fundamental book by Reinsch is noted, although acquiring it may take time. Overall, the conversation emphasizes the need for immediate access to quality physics questions.
harmeet_angel
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Actually, I reached here just while I was searching for them. So, I would be really thankful if someone somehow knows a site that has really good questions <those hard forces and motion questions>. I was reading some thread in here that said some fundamental book by reinsick or someone is really good, but that would take time to get that book, so for that time..
 
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http://feynmanlectures.info/" has some nice questions.
 
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TL;DR Summary: I came across this question from a Sri Lankan A-level textbook. Question - An ice cube with a length of 10 cm is immersed in water at 0 °C. An observer observes the ice cube from the water, and it seems to be 7.75 cm long. If the refractive index of water is 4/3, find the height of the ice cube immersed in the water. I could not understand how the apparent height of the ice cube in the water depends on the height of the ice cube immersed in the water. Does anyone have an...
Kindly see the attached pdf. My attempt to solve it, is in it. I'm wondering if my solution is right. My idea is this: At any point of time, the ball may be assumed to be at an incline which is at an angle of θ(kindly see both the pics in the pdf file). The value of θ will continuously change and so will the value of friction. I'm not able to figure out, why my solution is wrong, if it is wrong .
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