As of May 31, 2023, we have updated our Code of Conduct.

Questions tagged [acceleration]

The rate of change of velocity of a body per unit of time.

Filter by
Sorted by
Tagged with
0 votes
0 answers
42 views

Why is initial velocity 0 for retarding motion? [closed]

Issue details Why retarding has initial velocity 0? It should be same as max speed of the previous motion of the body. if you kindly look at this question: https://byjus.com/question-answer/a-car-...
Pankaj's user avatar
  • 101
0 votes
1 answer
30 views

In a fluid flow, how do you tell if negative acceleration is deceleration or change in direction?

When solving for the acceleration of a fluid flow, you use the equation: (∂u/∂t)+u(∂u/∂x)+v(∂u/∂y). If the solution at a given u and v are negative, how do you know if the flow has a negative ...
Ariana DeLuca's user avatar
8 votes
2 answers
1k views

In general relativity, why is Earth able to accelerate?

I was told and convinced that gravity is not a force, and in free fall you're an inertial frame and experience no force, and when on the surface of Earth you would be accelerating upwards. What I ...
Dhari's user avatar
  • 161
7 votes
2 answers
285 views

Power required to accelerate object [closed]

I am calculating power to accelerate an object of mass M in time T. My intuition tells me to calculate kinetic energy of the object and divide by T. Say a mass of 40 kg is accelerated from 0 m/s to 10 ...
Bill's user avatar
  • 71
1 vote
2 answers
58 views

Why we take $k=1$ in $F=ma$? [duplicate]

I know that $F$ is directly proportional to mass and acceleration but why in formula we take $k=1$ not other constant?
S K's user avatar
  • 27
1 vote
0 answers
57 views

Acceleration $v = sin (100t^2+2)$.? [closed]

The relationship between the velocity of the top of a birds wings with time before takeoff is modelled by $v = sin (100t^2+2)$. What is the acceleration after 0.5 seconds? Acceleration is the rate ...
MTGOD's user avatar
  • 31
0 votes
0 answers
20 views

Predicting position given constant angular + linear acceleration with a non-fixed axis

My readings on rotational motion always describes rotation around a fixed axis: that is, an object on a string, basically, and changes to angular velocity will alter speed such that the radius is ...
bigmoon_smallplanet's user avatar
-3 votes
0 answers
23 views

I want to know the answer not sure if mine is correct [closed]

[][1 I want to know the answer not sure if mine is right I got 240N for the driving force 600000 joules for work and 800 for power
K Kgfdf's user avatar
0 votes
1 answer
40 views

Does a rotating body resist acceleration in a direction that is perpendicular to the direction of the rotation of the body?

I would like to know if a rotating body resists acceleration in a direction that is perpendicular to the direction of the rotation of the body. Say for example there is a bicycle wheel with a tire on ...
user57467's user avatar
  • 383
2 votes
1 answer
53 views

(Circular motion) Acceleration is given, so why asked for more? [closed]

The full question is below. A car starts from rest and moves around a circular track of radius $32.0\,\text m$. Its speed increases at the constant rate of $0.500\,\text{m/s}^2$. (a) What is the ...
Stanley's user avatar
  • 21
10 votes
1 answer
2k views

Antennas and relativity

Antennas work by accelerating electrons to emit EM radiation. In fact, my understanding is that any accelerating electron will emit EM radiation. But in relativity, no frame of reference is preferred. ...
Marc DiNino's user avatar
2 votes
2 answers
75 views

Are the definitions of force and acceleration circular? [duplicate]

Force is defined by acceleration , and acceleration requires the determination of" inertial frames". But an inertial frames also requires the knowledge of forces which requires measuring ...
Leo Kovacic's user avatar
0 votes
0 answers
40 views

Physical and Diagrammatic representation of $a$=undefined when $v$=0 according to $a$=$vdv$/$dx$

$a$=acceleration $v$=velocity $x$=position along x axis $t$=time instant My teacher derived the $a$=$v$$dv$/$dx$ formula as follows Assume a particle at time $t$ is at $x$ position having $v$ velocity ...
Rita Garain's user avatar
2 votes
3 answers
83 views

How to understand the larger than $g$ acceleration of the free end of a falling chain?

In this article I read that the acceleration of the free end of a falling folded chain is greater than $g$, but I cannot really understand why. Why isn´t the acceleration just $g$ since it is a free ...
Michael's user avatar
  • 119
3 votes
5 answers
155 views

What happens physically when object is thrown up when $v$ becomes 0 at max height?

When velocity=0 during maximum height when an object is thrown up, what does that actually mean?? does that actually mean that the object doesn't change it's position over dt time period when at ...
Rita Garain's user avatar
0 votes
2 answers
52 views

Why tangential acceleration become 0 when the velocity is max?

I Know that tangential acceleration equal to zero when the circular motion is uniform, but why it is equal to 0 , when the velocity is max or min , because there is no relation between the value of ...
wissal's user avatar
  • 11
0 votes
1 answer
60 views

Velocity and acceleration of a ball shot uphill [closed]

Consider a ramp of length $100$ m and with a height of $10$ m. At the base of that ramp we're shooting a ball of mass $12$ kg uphill. Let's say the ball has a speed of $1$ m/s at $1$ m uphill. How can ...
Anti's user avatar
  • 103
-2 votes
1 answer
62 views

What is $V$ in $a$=$V$$dv$/$dx$? [duplicate]

$a$=instantaneous acceleration $V$=instantaneous velocity $x$=position $dx$=small Chang in position $a$=$dv$/$dt$ multiplying numerator and denominator by $dx$,we get $a$=$dv$.$dx$/$dx$.$dt$ now we ...
Aakash's user avatar
  • 151
0 votes
2 answers
84 views

Is the sensation of falling purely due to air resistance?

When I jump off of something, even with eyes closed I can be pretty certain that I'm falling due to the associated sensation of falling. However, as gravity should be affecting each of my internal ...
Christian's user avatar
0 votes
1 answer
37 views

Torque about an accelerating point

The total force acting on the pulley is zero so: $$F = mg + T_1 + T_2 \tag{A1}$$ Analyzing the torque and angular acceleration about the actual axis of rotation, the axle of the pulley, gives: $$τ_{...
xkcd's user avatar
  • 1
0 votes
1 answer
29 views

When a plane is accelerating upwards, why is both the upwards acceleration and gravitational acceleration positive?

At a weight m, a plane is acceleration upwards at rate of a. We also remember the value of g. From my understanding, we have two opposite forces that we care about. The force due the gravitational ...
user6076's user avatar
-1 votes
1 answer
43 views

Car crash - distance and acceleration no friction or rotation [closed]

A small model car is released by my hand and goes down a ramp and hits a wall. There is no friction or air resistance and the car is influenced by -9.8m/s^2 gravity. Why does the maximum acceleration (...
Python Undertale Coder's user avatar
0 votes
1 answer
47 views

How to calculate tangential and normal acceleration?

In a problem, I have the expression of acceleration and velocity in Cartesian coordinates , and it ask me to calculate the tangential and normal acceleration, so we don't know how I can do that, can ...
wissal's user avatar
  • 11
3 votes
1 answer
140 views

Why acceleration bigger when upward force is present?

Imagine object is falling down and has a mass of 1kg. There's an upward force on it of 50N. Let's calculate what the acceleration is. $$ F_n = ma = 50 - mg = 50 - 9.8 = 40.2 $$ where ...
Matt's user avatar
  • 357
1 vote
2 answers
38 views

Acceleration of an object after overcoming static friction

Let us imagine a rough horizontal surface with static frictional coefficient $u$ and an object of mass $m$ sitting on that surface. The maximum static frictional force that can be applied is $uN$ ...
madness's user avatar
  • 1,125
0 votes
2 answers
28 views

Average acceleration to distance travelled. Equation gives wrong answer

i wanted to verify the measured data with calculations. So i got two totally different answers when calculating average acceleration. V0 = 0 km/h Vf = 30 km/h = 8.33 m/s t = 9.32 s S = 55.59 m So &...
wtknow's user avatar
  • 3
1 vote
0 answers
93 views

What is the link between normal acceleration and radius of curvature? [closed]

hope you are well, So , in my physics class we use graphical method to determine the radius of curvature and as we know this method isn't very accurate, so when I watch a YouTube video I find this ...
wissal's user avatar
  • 11
8 votes
3 answers
2k views

Can a rotating object accelerate by changing shape?

Suppose an object is already rotating in a situation of no external forces such as gravity or friction. Is it possible or impossible for it's velocity (linear) to change by the shape of the object ...
JohnTrainor's user avatar
1 vote
0 answers
75 views

Time dilation under constant acceleration

If I am given: the distance of two points the (constant) force being enacted on the object moving between those two points how can I figure out: the time it would take the object to reach the other ...
Mix 182's user avatar
  • 11
0 votes
1 answer
49 views

If centripetal acceleration is pointed radially inward and it has a value $Ac = v^2/r$ is there not a value for centripetal velocity?

In uniform circular motion, an object is said to move tangentially along a circular path with a changing tangential velocity but a constant tangential speed. The velocity changes because the direction ...
thuang's user avatar
  • 41
0 votes
1 answer
27 views

Finding the velocity when the force is in terms of position [closed]

(The unit of position, mass, time is m, kg, s.) On a horizontal line, a force $F=-6x$ (where $x$ is in meters) is applied to a particle of mass $M=3$. When $x=3$, the velocity $v=6$. What is the ...
xiver77's user avatar
  • 117
0 votes
0 answers
27 views

How would we perceive a pulse of light if we accelerated constantly in the same direction? [duplicate]

I'm watching this video (the link starts at the relevant timestamp) and am confused about one thing. Let's say I'm going at a constant speed of $0.99c$ in $+x$ direction (w.r.t Earth), and a pulse of ...
user9343456's user avatar
  • 1,132
0 votes
1 answer
43 views

Coriolis Force question

Let's say a ball moves in an azimuthal path around a rotating disk. The Coriolis force on the ball is given by $-2m \omega \times v$. My intuition tells me that there would be no Coriolis force ...
guy person's user avatar
2 votes
2 answers
71 views

Trying to gain better intuition about fictitious forces

Recently started doing some reading into fictitious forces. It's easy enough to understand when dealing with linearly accelerating frames but I find it more challenging to understand rotating frames ...
guy person's user avatar
0 votes
1 answer
97 views

As the speed time graph for a body thrown vertically upwards is not differentiable at the top point so why acc. is taken as 9.8 m/s² at the top point?

In the shown speed - time graph for a body thrown vertically up there is a sharp kink in the graph at the instant for which body is at highest position ie not differentiable so we can't find ...
Shinnaaan's user avatar
  • 1,055
1 vote
1 answer
48 views

Earth surface acceleration and inertial geodesics

I hope this is an appropriate question for this forum. It is one I have struggled with for a while. I read that in GR gravity is not a force, and that the apparent force we feel and can measure (eg ...
Jeff Roberts's user avatar
0 votes
2 answers
71 views

Why can't we feel Earth's acceleration? [duplicate]

The centripetal force on Earth is constantly exposing Earth to the acceleration. Why can't we feel this change of direction?
yaxraz's user avatar
  • 1
0 votes
2 answers
75 views

Does Newtonian mechanics define an absolute rotational reference?

I note that there are several question related to absolute rotation so this may be a duplicate but I didn’t see an exact double. In any case, mine is this: In a hypothetical universe made up by only ...
Mikael Jensen's user avatar
0 votes
0 answers
26 views

Cyclist coasting on a plane road (only air resistance and rolling resistance apply)

I am currently trying to simulate a cyclist. Right now I am looking at the change of velocity when the cyclist is coasting on a plane road. These are the values I am using: ...
Tobias Gassmann's user avatar
0 votes
1 answer
63 views

Change in $g$ effective due to rotation

$g$ effective at any latitude changes due to rotation of earth. Does it also change due to rotation when the body is at height or at depth or does it change only at the surface? Edit: I am referring ...
Phy14's user avatar
  • 39
0 votes
1 answer
44 views

Force exerted on vehicle when hitting an object [closed]

How can i calculate force that is exerted on a vehicle when it hits an object? Vehicle speed is 40 km/h, mass is 1500kg Object is standing still (speed is 0 km/h), object mass is 11kg. Now this ...
wtknow's user avatar
  • 3
4 votes
3 answers
2k views

Does acceleration make you heavier?

I'm looking at this article from Scientific American: https://www.scientificamerican.com/article/star-wars-science-light-speed/#:~:text=Normal%20humans%20can%20withstand%20no,heavier%20blood%20to%...
Thomas's user avatar
  • 81
1 vote
4 answers
67 views

How can I factor friction into acceleration, given power?

I'm trying to work out an acceleration curve for a vehicle for a simulation, but despite a bunch of research there are a couple of things I still don't understand. First we have $P = mav$. Assuming ...
ArtOfCode's user avatar
  • 147
1 vote
1 answer
44 views

Confusion regarding net acceleration of the bob in the bottommost point of the trajectory of a pendulum?

Here is my analysis from the inertial frame on it: At the bottom most point, $g$ acting downwards $v^2/r$ (centripetal acceleration) acting upwards So the net acceleration, a = $(v^2/r)-g$ right? ...
Elizabeth Huffman's user avatar
0 votes
1 answer
22 views

Are terms tangential acceleration and normal acceleration only used for instantaneous velocity?

Are terms tangential acceleration and normal acceleration only used for instantaneous velocity?
Naman Singh's user avatar
0 votes
1 answer
54 views

Proper acceleration along perpendicular directions

Let's take an object (all times mentioned in this problem are proper times). There is a constant proper acceleration "$a$" on this object in the x-direction for time $t, 0\leq t \leq \tau$. ...
Soumyadeep sarma's user avatar
0 votes
2 answers
75 views

Does a simple pendulum have some radial acceleration at its extreme positions where its speed becomes zero?

Suppose we have a simple pendulum swinging between two extreme positions. At the extreme position its speed becomes zero. As per this reason can I say that at extreme positions radial acceleration (v^...
Shinnaaan's user avatar
  • 1,055
0 votes
1 answer
100 views

Why does a centrifuge cause blood to be pushed downwards in the human body?

Good evening all, I recently watched this YouTube video about a centrifuge by Tom Scott (https://www.youtube.com/watch?v=DMKcO-T5Y4o). Around the 2:30 mark, it is said that blood will be 'pushed ...
Thomas's user avatar
  • 81
0 votes
1 answer
89 views

A way of expressing acceleration in general relativity

Using this question: How can we recover the Newtonian gravitational potential from the metric of general relativity? I want to formulate my question: Can the first term of the energy-stress tensor, ...
Anto's user avatar
  • 97
0 votes
0 answers
49 views

About jounce (snap)

About jounce (snap). So change in acceleration is know as jerk, so like this is still imaginable but what is change in jerk, like can you give some real life example where that is happening.
Kutubkhan Bhatiya's user avatar

1
2 3 4 5
58