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HNQ
5:22 AM
3
Q: An unintuitive situation related to work and energy

user270701Consider an object which has been given a speed $v$ on a rough horizontal surface. As time passes, the object covers a distance $l$ until it stops because of friction. Now, Initial kinetic energy = $\frac{1}2mv^2$ And final kinetic energy is zero. Therefore, work done by friction on the object i...

 
 
13 hours later…
HNQ
6:10 PM
2
Q: How can a massless string move if the net force on it is always zero?

Jacob GonzalezLets say we have a frictionless and massless pulley with a massless string over it. There are two masses attached to it $m_1$ and $m_2$ where $m_2>m_1$. So $m_2$ would an experience an acceleration down while $m_1$ experiences an acceleration up and massless string would also move accordingly. Ho...

 

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