All Questions
4
questions
2
votes
3
answers
113
views
What is wrong with this reasoning?
Suppose a particle is rotating about a point at a distance $r$, then since $r$ is constant $\frac{\text dr}{\text dt}=0$ so the component of velocity along the position vector should be zero. ...
- 88
0
votes
1
answer
137
views
Why is acceleration in the rotating system zero?
Given a circular body that rotates around itself and there is a band(or iron line) that connects between the Cartesian coordinate system and its Perimeter, on the band, there is an ant that walking ...
- 101
0
votes
2
answers
542
views
Noninertial frame of reference
For a car that is accelerating linearly, the non-inertial frame of reference is the driver in the car where from his reference frame, the car is stationary. It is so called stationary because the non-...
- 381
-1
votes
1
answer
3k
views
Why is angular acceleration of a pendulum always negative?
I was trying to derive using the Lagrangian the equations of motion of a simple pendulum under the influence of gravity. Eventually, I was brought to this conclusion:
$$\alpha = -(g\sinθ)/l$$ where $\...
- 182