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# Questions tagged [acceleration]

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

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### 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-...
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### 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 ...
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### 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 ...
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### 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 ...
1 vote
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### 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?
1 vote
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### 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 ...
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### 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 ...
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### 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
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### 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 ...
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### (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 ...
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### 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. ...
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### 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 ...
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$a$=acceleration $v$=velocity $x$=position along x axis $t$=time instant My teacher derived the $a$=$v$$dv/dx formula as follows Assume a particle at time t is at x position having v velocity ... 2 votes 3 answers 83 views ### How to understand the larger than g acceleration of the free end of a falling chain? In this article I read that the acceleration of the free end of a falling folded chain is greater than g, but I cannot really understand why. Why isn´t the acceleration just g since it is a free ... 3 votes 5 answers 155 views ### What happens physically when object is thrown up when v becomes 0 at max height? When velocity=0 during maximum height when an object is thrown up, what does that actually mean?? does that actually mean that the object doesn't change it's position over dt time period when at ... 0 votes 2 answers 52 views ### Why tangential acceleration become 0 when the velocity is max? I Know that tangential acceleration equal to zero when the circular motion is uniform, but why it is equal to 0 , when the velocity is max or min , because there is no relation between the value of ... 0 votes 1 answer 60 views ### Velocity and acceleration of a ball shot uphill [closed] Consider a ramp of length 100 m and with a height of 10 m. At the base of that ramp we're shooting a ball of mass 12 kg uphill. Let's say the ball has a speed of 1 m/s at 1 m uphill. How can ... -2 votes 1 answer 62 views ### What is V in a=V$$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 ...
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### 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 ...
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1 vote
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### 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 $uN$ ...
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### 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 &...
1 vote
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### 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 ...
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### 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 ...
1 vote
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### 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 ...
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### 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 ...
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### 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 ...
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### 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 ...
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### 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 ...
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### 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 ...
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### 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 ...
1 vote
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### 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 ...
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### 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?
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### 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 ...
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### 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: ...
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### 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 ...
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### 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 ...
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1 vote
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### 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 ...
1 vote
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### 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? ...
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### Are terms tangential acceleration and normal acceleration only used for instantaneous velocity?

Are terms tangential acceleration and normal acceleration only used for instantaneous velocity?
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### 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 $t, 0\leq t \leq \tau$. ...
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### 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^...
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### 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 ...