All Questions
7
questions
4
votes
6
answers
1k
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Does work-energy theorem account for thermal energy?
Suppose a box (which I assume to be a rigid body) with an initial velocity that starts to slide on a level surface with friction. Imagine this experiment is done in vacuum, so there is no air drag or ...
- 61
0
votes
0
answers
15
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How to calculate the surface heating of the ball thrown in different fluid mediums like air and water?
Let's say a ball is thrown at a certain velocity, then it follows a projectile motion and falls on the surface. Now, during this entire flight how can we calculate the temperature rise that happens in ...
- 101
0
votes
2
answers
39
views
On source of heat energy dissipation in a system
Suppose we have a block of mass m which was at rest on a rough floor and is now given an impulse towards a wall.It is given that the collision with wall is perfectly elastic and no energy is lost in ...
2
votes
2
answers
1k
views
Explaining friction using Hamiltonian mechanics
I have heard the opinion that it is a good assumption that microscopically all forces are actually conservative so in principle all classical mechanics problems could be solved using Lagrangian / ...
- 399
1
vote
1
answer
836
views
Why friction causes energy to be lost in terms of heat when it appears to be an energy transfer mechanicsm?
For example, when we move/walk, we apply a force (via friction) on earth, and the earth in turn on us. So essentially I see it as an energy transfer as follows:
Suppose I move in same direction as ...
- 13
0
votes
1
answer
63
views
Heat loss in wheels
Is there a simple model for heat loss in car wheels that simply takes into account the width of the wheel and its angular speed? My guess is that if there is such a simple model, it would be a non-...
user29305
4
votes
2
answers
3k
views
Where does the lost energy go in a rubber band powering a rotating shaft?
Okay, I'm no physics whiz, and this has me stumped. You know those toy airplanes you can get with the rubber-band driven propellers? You twist the propeller a bunch of times, and this stores ...
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