All Questions
Tagged with acceleration kinematics
79 questions
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Does the SUVAT equations of motion (Kinematics) come from some differential equation?
Wikipedia says about the equations of motion that;
"If the dynamics of a system is known, the equations are the solutions for the differential equations describing the motion of the dynamics.&...
2
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6
answers
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How can an object with zero acceleration move?
My physics text has a problem in which it is said that a person moves a block of wood in such a way so that the block moves at a constant velocity. The block, therefore, is in dynamic equilibrium and ...
- 131
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5
answers
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Acceleration and motion can be in different direction?
I'm not getting what acceleration concept is and how it relates to motion and how motion and acceleration can be in different direction? And what's behind the concept of negative and positive ...
- 31
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6
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Is four-acceleration spacelike? How to show this? What does it mean?
Consider a four-velocity $u_\mu$ that satisfying $u_\mu u^\mu=c^2>0$. Differentiating w.r.t the proper time $\tau$, we get the equality $a_\mu u^\mu=0$ which means the four-velocity and four-...
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Formula to determine acceleration based on constant energy input
I'm a software engineer building a simulator for train movement. What I would like to do is create an acceleration curve that's closer to reality.
This is my thinking, which includes some ...
- 31
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3
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For circular motion in a vertical plane, why does Net Force = Centripetal Force?
I'm struggling with some of the concepts pertaining to the forces and acceleration associated with circular motion in a vertical plane (only concerned with what happens at the 'top' and 'bottom' of ...
2
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3
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966
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Does a constant 4-acceleration implies constant acceleration?
Before asking the question I explain here my line of thoughts:
I'm almost sure that a constant acceleration $\bf{a}$ implies constant 4-acceleration $w^\mu$. So I assume constant acceleration, then, ...
- 2,415
2
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3
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Getting position from an accelerometer on an Android phone
I know that integrating acceleration twice will give me position (acceleration-->velocity-->position) but how can I do all this when I all I have are a set of data points (ex: 1 second = some # m/s^2);...
- 143
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1
answer
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Finding Average Acceleration with only given angle [closed]
A car enters a curve in the road with a speed of 32 m/s and emerges from this curve 4 s later with the same speed. However, the direction of the velocity changes by 150 degrees during this time.
What ...
- 21
1
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1
answer
338
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How to calculate traveled distance with non-constant acceleration in time? [closed]
I know this formula $D = vt + \frac{1}{2}at^2$ for calculating the distance given initial velocity, time and acceleration. But what if my acceleration is not static, but increasing exponentially ...
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2
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Acceleration: Value Disparity?
If we consider a ball moving at an acceleration of $5\ \mathrm{m\ s^{-2}}$, over a time of 4 seconds, the distance covered by the ball in the first second is $5\ \mathrm m$. In the 2nd second will $5\ ...
- 383
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Using acceleration to plot position
Sorry if this question is dumb, and I know is physics 101, but I'm not that good with physics.
I'm writing an iPhone program that by collecting the acceleration data of the device tries to replicate ...
- 113
1
vote
1
answer
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Calculation of Distance from measured Acceleration vs Time
I have an Accelerometer connected to a device that feeds the instant values of the acceleration in the 3 directions. I've tried to calculate the distance for a vertical movement using these values ...
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3
answers
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Finding normal and tangential velocity and acceleration for motion along a 3D curve
Basically, I have a major problem on my hands.
As part of an assignment, I have been given a set of 3D points, as well as the time between them, and nothing else, and I'm supposed to find the ...
- 21
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1
answer
9k
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Zero velocity and non-zero average acceleration
Can you have a zero velocity and nonzero average acceleration?
I am confused with the word "average" here. If the question would be, "Can you have a zero velocity and nonzero acceleration?" my answer ...
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1
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1
answer
501
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Find constant acceleration needed to reach point (possibly related to projectile motion on slopes) [closed]
Given a particle with a position $p_0$ and an initial velocity $\vec{v_0}$, what acceleration $\vec{a}$ do we need to reach point $p_1$ and how long until we have reached $p_1$? The magnitude of the ...
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2
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2k
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Average acceleration versus instantaneous acceleration
Does instantaneous acceleration also changes when direction of velocity changes. I know average acceleration does change.
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2
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634
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How do I get the velocity $v$ as a function of position $x$ from the acceleration $a$ as a function of velocity?
Suppose that a particle is moving with a non-constant acceleration on the $x$ axis of $$a(v)= Av^2+Bv+C$$ ($A$, $B$ and $C$ are constants) with an initial velocity of 0 on the x axis and an initial ...
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1
answer
254
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Circular motion - vectors [closed]
We are asked to show that, if
$$\frac{{\rm d} \mathbf{r}}{{\rm d}t} = \mathbf{c}\times\mathbf{r},$$
where $\mathbf c$ is a constant vector, then the body moves in uniform circular motion.
I have ...
- 361
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3
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2k
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Accelerometer measures 1g along z-axis
I have an accelerometer which measures 1g along the z axis when resting on a table. I don't understand why this is because the net force on the accelerometer is zero along the z-axis as the force of ...
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4
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What happens when a body is moving in a non-uniform circular motion?
What happens when a body is moving in a non-uniform circular motion where tangential acceleration is also present?
Will it continue to move in circular path or it will take an elliptical orbit?
user297948
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2
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Acceleration during collision with ground
For my physics class, I have to calculate an objects acceleration while it came to a stop. It was traveling at $6.26\: \mathrm{\frac{m}{s}}$ at impact, and travels a distance of $0.025\: \mathrm{m}$ ...
0
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3
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Are acceleration and velocity simultaneous? [closed]
I would think yes because, if a rope tied to a swinging rock breaks, the rock flies off in the direction that is perpendicular to the direction of the last instant of the acceleration. The ...
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Finding Acceleration Force of Gravity on Rotated Accelerometer
Is it possible to calculate the force of gravity on the $x$, $y$, and $z$ readings of an accelerometer if I know the rotation of the sensor? If so, how would I do this?
Sorry if I am doing this wrong,...
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2
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467
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What to call an object which is in motion but not accelerating?
I began learning about acceleration and according to the source i learned from an object only accelerates when there is change in vel. &/ direction... what i am wondering is what do you call it ...
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2
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What's the formula for the speed of an accelerating car?
I am trying to find a formula that closely describes the speed of an accelerating car over time. I have found many graphs on the internet, but so far no formulae to generate them. For my purposes I ...
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1
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15k
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Calculate acceleration and time given initial speed, final speed, and travelling distance? [closed]
A motorcycle is known to accelerate from rest to 190km/h in 402m.
Considering the rate of acceleration is constant, how should I go about calculating the acceleration rate and the time it took the ...
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1
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Is the term "deceleration" ambiguous? Does it refer to negative acceleration, or is it something else entirely? [closed]
What does that term truly mean? Sometimes it confuses me what exactly it refers to.
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3
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What would happen if an unstoppable force hits an immovable object? [closed]
I realize that the question a rather large paradox, but I do wonder if such a thing were true what would happen, assuming that neither of these "objects" can be destroyed by each other?
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