Questions tagged [acceleration]
The rate of change of velocity of a body per unit of time.
3,199 questions
3
votes
3
answers
507
views
How to calculate optimal engine RPM range to get maximal acceleration?
I find here: video 1 and video 2 that say that for acceleration is only important power not torque.
Internal combustion engines have power and torque that vary with RPM. Power and torque are connected ...
- 1,004
-4
votes
1
answer
172
views
Why circulating electron loses energy, as in CPT perspective it is also circulating charge now gaining energy?
While physics is believed to be CPT symmetric in equations, this symmetry is clearly broken in solution we live in, e.g. by entropy growth.
I would like to ask about different asymmetry in solution: ...
- 1,196
1
vote
3
answers
118
views
Newton's 2nd Law [duplicate]
We know:
$$ F = \frac{dp}{dt} $$
and:
$$p = mv$$
so by simple calculus, is it correct to write:
$$ F = m \frac{dv}{dt} + v \frac{dm}{dt} $$
If not, why not?
- 11
1
vote
0
answers
48
views
Trying to understand acceleration in General Relativity [duplicate]
Wikipedia says this about acceleration in General Relativity:
"There is no gravitational acceleration, in that the proper acceleration and hence four-acceleration of objects in free fall are ...
- 11
0
votes
2
answers
233
views
A body has acceleration when the net force acting on it is equal to 0 according to Newton's 2nd law
There is a block $A$ on the table; the friction between the table and the block is not taken into account. A cube $B$ lies on the block, the coefficient of friction between the cube and the block is $...
- 39
2
votes
0
answers
66
views
Additive term to the lagrangian of accelerated charged particles caused by Larmor radiation in classical mechanics
Considering two interacting charged particles $Q_1$ and $Q_2$, the Euler-Lagrange equations are:
$$\dfrac{d}{dt}\dfrac{\partial L_j} {\partial \dot{q_j}}-\dfrac{\partial L_j} {\partial q_j}=0$$
where: ...
- 633
6
votes
2
answers
829
views
Does the constant horizontal velocity of a projectile with relativistic velocity components reduce as it accelerates downward?
Assume an electron/proton is shot perpendicularly into a huge uniform electric field with a constant horizontal velocity of a considerable portion of the speed of light ($v_x=0.8c$). As it accelerates ...
- 2,916
1
vote
1
answer
177
views
Analysing $a$ = $v\frac{dv}{dx}$ expression in 1D linear and 2D curvilinear motion cases
$a$ = $v\frac{dv}{dx}$
This is a well known formula for acceleration in 1D motion cases. And it gives total acceleration in 1D cases. Please correct me if I'm wrong.
When it comes to a general 2D ...
- 956
7
votes
2
answers
1k
views
Is there any difference between fatal acceleration and fatal deceleration?
On hearing that electric vehicles (EVs) are reaching 0-100 miles per hour in under a second, I was curious whether we're getting into concussion-causing territory (we're not). I mentioned this to my ...
- 87
8
votes
3
answers
838
views
Explain: Acceleration of charge radiates energy while constant velocity does not. Or does it?
Feynman develops the so-called Feynman-Heaviside formula, similar to the Jefimenko equation
$$\mathbf{E} = \frac{-q}{4\pi \varepsilon_0} \left[ \frac{\mathbf{e}_{r'}}{r'^2} + \frac{r'}{c} \frac{d}{dt}...
- 482
2
votes
2
answers
171
views
How much does air in a vehicle dampen the feeling of acceleration?
You're standing on a train. The train starts suddenly, your feet are on the floor so they start moving with the train but the rest of you doesn't. You stumble back a step and catch your balance as ...
1
vote
3
answers
187
views
Why is it consistent to apply Newton to non-inertial frames via pseudoforce?
To impose pseudoforce on accelerating frames (step 1), is okay.
But then apply Newton's laws (step 2)— is that okay?
Because it deems the modified frame as inertial (necessary for application of our ...
- 324
2
votes
4
answers
239
views
Do all forces in the universe obey Newton's second law?
Is it true that every force is directly proportional to acceleration.
- 187
-4
votes
3
answers
225
views
Symmetrical Twin Paradox [closed]
Suppose twins A and B leave Earth in two rockets, each accelerating at 9g until reaching 0.5c.
Then twin A slows down at 9g and immediately returns, accelerating at 9g until reaching 0.5c, and finally ...
-5
votes
1
answer
285
views
Is it rational to deduce that "inertia" is indeed due to the "self-force"?
It is known that inertia is a fundamental property of mass that shows an object's resistance to changing its state of motion, while the self-force opposes the acceleration due to the effect of ...
- 2,916