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HNQ
1:03 AM
3
Q: Why does something get hotter when mechanic work is done on it?

ACRafiSuppose you drag a piece of sandpaper along the surface of a wall(let's keep it simple). Here you are doing positive mechanic work on the sandpaper, this makes it gain energy. Friction does negative work on the sandpaper which makes it lose energy. Now, we know that bcz the sandpaper is in motion...

thermodynamics temperature work friction
 
 
15 hours later…
HNQ
HNQ
3:44 PM
2
Q: Confusion regarding Inelastic Collisions contradicting my book

MehmerSuppose two bodies $A$ and $B$ with equal mass are kept at a distance. $A$ starts moving towards $B$ at a constant velocity, they hit, and I assume that it is a PERFECTLY INELASTIC collision here. According to what I learnt from my book, suppose a body hits another body and inelastic collision ta...

newtonian-mechanics conservation-laws velocity collision relative-motion
 
 
5 hours later…
HNQ
HNQ
9:04 PM
2
Q: Guidelines to calculate moment of inertia

bananenheldThe moment of inertia is defined as $$I = \int r^2 dm$$ but I am not sure how to proceed with solving the above integral. All examples I have seen seem to be done with different strategies. They usually start: "well consider this part of the mass $dm$" and then suddenly just plug in $2 \pi r $ an...

newtonian-mechanics integration calculus moment-of-inertia
 
 
2 hours later…
HNQ
HNQ
10:49 PM
2
Q: How can an object do work?

CaetaI read in many sites that the concept of mechanical energy is the ability of an object to do work, but how can an object do work? Isn't it rather the force applied to that object the one that produces work and not the object itself?. We can have an object that has mass $m$ and a constant speed $v...

newtonian-mechanics forces energy work definition
 

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