Recent content by Mike_bb

I don't agree with this approach. I can say that by definition 2*2=5. There is always a reason why this or that thing has meaning behind it.

You can't understand why work is dot product of force and displacement, right?

Could you provide the source where this is written? (Newtonian mechanics is assumed that we have deal with instantaneous interactions. But Albert Einstein demonstrated that no interaction or transmission of information can occur faster than the speed of light.)

What do you think about following concepts? https://en.wikipedia.org/wiki/Negative_mass Tachyon with imaginary mass: https://en.wikipedia.org/wiki/Tachyonic_field

Dale, Reading the textbooks is good practice but communication with scientists is the best practice. :smile: Mind ignites mind. (Johann Wolfgang von Goethe)

Dale, big thanks!! I just got an insight into how it works!

There was: If we consider the infinitesimal displacement of a body under the action of the support reaction force over an infinitesimal time interval ##dt##, this displacement is precisely due to the body's proper acceleration.

I found another explanation. It's written about infinitesimally small displacement ##dx## that is caused by support.

In explanation it's written that the body on the support is not at absolute rest.

In the previous post I wrote about infinitesimally small displacements not deformations.

The support thrust up the body. This is infinitesimally small displacement upward. Sum of such displacements (integral) is result displacement of the body.

Dale, I've found explanation why the body doesn't lose contact with the support and accelerates upwards. Infinitesimally small deformations play key role in the process of the acceleration. These deformations cause atoms to accelerate synchronically and the body accelerates. I think that since...

Dale, Thanks. Could you elaborate how does constant upwards acceleration produce motion?

I've read about Einstein's lift experiment and I understood it. But I can't imagine how it is possible that body doesn't lose contact with support but accelerate, although experiment works indeed.

A.T., No. I have no problem with kinematics. Problem: surface and the body are still. They don't lose contact with support.