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Questions tagged [acceleration]

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

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Is there any force that affect to wearable accelerometer underwater?

I am trying to find displacement of underwater sport player with my accelerometer sensor. My question is; is there any force that affect to an object that weared by a human underwater? Thanks.
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8answers
1k views

What if Force was not Mass times Acceleration? [on hold]

We know that Force equals Mass times Acceleration, $F = ma$. But what if we had a law like $$F=m^2a$$ or $$F = 2ma~?$$
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2answers
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Speed and tangential acceleration in pendulum motion

Speed is a scalar quantity which corresponds to the magnitude of velocity, so it must always be nonnegative. In a general 2d motion, the tangential component of acceleration is given by the time ...
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1answer
66 views

Length contraction of an accelerating rod

Let us assume a rod of length, $4l$, initially at rest. The coordinates are defined s.t - (assuming uniform density) $$X_{back-end}(0) = -2l$$ $$X_{front-end}(0) = +2l$$ $$X_{mid-point}(0) = 0$$ ...
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Find the deceleration of a car during braking [on hold]

the question is: How do you find the deceleration of a car during braking, if you only know the stopping distance of 35.6m at 100km/h??
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1answer
67 views

How do you solve the twins Paradox? [duplicate]

I'm a beginner physics student only studying elementary AP-level physics and calculus, so when I came across the conceptual basis of the twins paradox I was, of course curious. People often explain ...
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6answers
130 views

Acceleration in free fall [duplicate]

A body in free fall "feels" no gravitational force (equivalence). Why does it continue to accelerate. Why is your program refusing my question?
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2answers
54 views

A fictitious force in an orbiting frame of reference that is not rotating

Say we have an inertial frame of reference where there's a motionless star at the center and a planet is in circular orbit around it. We further assume that the planet is not rotating in the inertial ...
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2answers
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How is normal force in circular motion?

Let's say I have a vertical ring and a bead is sliding on it. I understand normal force is always acting radially and that in general the radial component of weight is not equal to the normal force....
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Compression of air layer by parallel planes

When object is falling and close to the ground "liquid pillow" appears under it. Object is of cylindrical form. The differential equation that describes the motion is: $$m\frac{dV}{dt} = mg - \frac{...
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2answers
66 views

If in space with no opposing force,will a body of 1kg pushed with 1N force keep on accelerating 1m/sec every second? When will it stop accelerating? [duplicate]

If in space with no opposing force,will a body of 1 kg pushed with 1 N force keep on accelerating 1 m/sec every second? When will it stop accelerating?
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1answer
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Pressure in a flowing fluid

If a fluid ( ideal) flows, say from left to right, then is the pressure at any point inside the fluid still independent of direction and has the same value no matter how I orient a surface element at ...
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0answers
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Does tilting a liquid develop shear stress on its surfaces?

Please help me these confusions I have. If I tilt a cuboidal container containing an ideal fluid (non viscous liquid), does a shear stress develop on the liquid due to some shearing force acting ...
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1answer
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Hyperbolic motion with non-zero initial velocity

The equations of hyperbolic motion in a single spatial direction with initial velocity of zero are pretty easy to find given a bit of googling, such as in this answer. And while I'm too rusty at ...
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0answers
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Derivation for magnitude of acceleration of a body in orbit with general relativity coefficient?

I came across an equation that an old professor used in an orbital simulation code and wanted to know how this equation was derived? I also wanted to know where $\alpha$ came from and what it ...
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2answers
62 views

If an object in free-fall is moving upward, the object's velocity is decreasing. Does this mean that the acceleration is -9.8 m/s/s?

I have a problem (that I am not asking you to solve) where it takes $4s$ for an object to travel upward to its maximum height, and we have to determine how far the object travelled. If the ...
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1answer
33 views

Change of variable in function

Suppose I have a function $h(\theta)$ measuring the height of a piston, with $\theta = \omega t$. I would like to know the vertical acceleration of this piston as $\omega$ changes at the point $\theta ...
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2answers
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How to decelerate from velocity $v$ to stop time $t$ over distance $d$? [closed]

I'd be grateful for some help with this problem I am trying to solve. Let's say that I have an object travelling at a velocity $v$. I want that object to come to a halt in time $t$ AND travel exactly ...
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0answers
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How to remove gravity component from accelerometer X,Y,Z reading - 3D space [duplicate]

I'm working with Arduino & MPU-6050 i have read the aX,aY,aZ respectively acceleration in X,Y,Z axis . I have roll, pitch, yaw too. Now I can to calculate acceleration removing gravity component. ...
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1answer
49 views

Dynamically changing acceleration of object moving towards sun due to gravity

For a collection of sci-fi short stories set in the rather near future I need an approximation of the time it would take a space ship to travel from an Earth orbit to Ceres. In a previous story of ...
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0answers
33 views

Friedmann Expansion

I have a strange question that I can visualize but not find anything to really answer my query. The Newtonian law states that something in motion tends to remain in motion. We all know about ...
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0answers
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Gravity and Newton's Second Law of Motion [duplicate]

So we were learning about Newton's 3 Laws of Motion and I had a question about the second law and gravity. Newton's 2nd law shows that, with a constant force, if an object has a greater mass, it will ...
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1answer
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Does Horizontal Velocity remain constant when it hits a surface in a Parabolic Motion?

It is told in one of the answers that the horizontal velocity stays at 4.0 m/s after the ball bounces from the plate. Why is it still at 4.0m/s, isn't there friction or is it neglected for the sake ...
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3answers
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Why isn't acceleration always zero whenever velocity is zero, such as the moment a ball bounces off a wall? [duplicate]

The answer to this homework problem is $\left(\text{D}\right) :$ I understand why we rule out options $\left(\text{A}\right)$ and $\left(\text{B}\right)$ first. However, I don't get why $\left(\...
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4answers
51 views

Acceleration-time graph

1) At first, the acceleration opposes the direction of velocity and the object must be slowing down. 2) At t=4, is the object’s velocity would have been at rest if the acceleration changed to 1.5 m/...
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2answers
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Force and center of mass acceleration

https://i.stack.imgur.com/3w7Mt.png I have a rod with mass $m$. Above are two ways I can apply a perpendicular force to the rod. Since the mass of the rod is uniform, its center of mass is in the ...
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1answer
49 views

Does a black hole have thrust? Could they be acting as galactic engines? [closed]

I identify four possible kinds of thrust below (there may be more or less). I don't know how to do the math to test them though. Direct transfer of kinetic energy as thrust. The energy of objects ...
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3answers
47 views

If you were to push a block in space in an ideal vacuum scenario with zero friction, what would be the final velocity of that object

Say you push an object with 10 N force(just once and let it go) of mass 10kg object in space with zero friction and nothing in the way of its path. What would be the velocity of that object? I would ...
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2answers
92 views

Does an classical charge that is stationary in a gravitational field radiate?

The well known Larmor formula tells us that an accelerated classical charge radiates a power proportional to the square of the acceleration. It has been shown that a charge in free fall in a ...
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6answers
271 views

If an object with more mass experiences a greater gravitational force, why don't more massive objects fall faster? [duplicate]

According to Sir Isaac Newton, the gravity equation runs like this: $$ F = \frac{Gm_1m_2}{r^2} $$ where $F$ is the gravitational force, $G$ the gravitational constant, $m_1$ and $m_2$ are the ...
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3answers
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Moment of Inertia Race [closed]

Wikipedia shows an example of how to the moment of inertia determines how fast a rotating object rolls down an incline plane. the race Includes: spherical shell, solid sphere, cylindrical ring. solid ...
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2answers
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Find the time when tangential acceleration is equal to radial acceleration [closed]

A particle begins to move along a circular path of radius R with a constant magnitude tangential acceleration of $a_t$. After time $t$ it's the centripetal acceleration is equal in magnitude to ...
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1answer
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Do “light” and “heavy” objects still accelerate at the same rate at near light speeds?

My (very poor) layman's understanding of physics is that as something approaches c, it has a relativistic mass that is a combination of its actual mass and velocity. Do this affect its acceleration ...
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2answers
60 views

Acceleration of two bodies on an incline and the normal between them [closed]

Question: What is the acceleration of each body, if they slip along the incline? What is the normal between them? Assume the incline to be frictionless and neglect air resistance. My teacher solved ...
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1answer
38 views

Calculate speed of an object using angle and time [closed]

I haven't had any physics class or anything close to that in a long time, and I'm currently confronted with an exercise I don't remember the formula(s) to solve it. Assuming I have an object of ...
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1answer
77 views

Is it speed or acceleration that leads to time dilation? [duplicate]

Is it acceleration or speed that leads to time dilation or both? For example, when a spaceship accelerated to (almost) the speed of light, then reversed course to come back towards earth, does this ...
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1answer
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Why does mass cause resistance to acceleration?

If I were in a vacuum with no gravity or friction, why would it be harder to push a floating bowling ball than a marble? Is there anything happening on an subatomic level that makes matter act ...
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0answers
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why a car with very high speed topples away from the center of turning when it is cornering? [duplicate]

If a car is turning to the right with very high speed, why the car will topple to the left and cause an accident?
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1answer
43 views

Convert inertia formula to excel calculator

I've been looking at this question: "Weight" of moving object in a car collision but to be honest I can't get my head around how to work it out myself (I'm not a physics student!). What ...
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1answer
49 views

Using two simple pendulums to estimate $g$

I know that using the period expression for a simple pendulum we can have an estimation of the acceleration of gravity $g$. I encountered the following question One way of measuring the terrestrial ...
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0answers
60 views

When will a person falling into a black hole be crashed by tidal forces?

Assume that a person can resist $30g\approx 300\frac m{s^2}$ (remark: the record is actually at 46.2). I want to solve for the distance $r$ at which a $1.5m$ tall slim person falling radially into a ...
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0answers
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Why alternating current produces electromagnetic waves? [duplicate]

So my question is: why alternating current produces electromagnetic waves? There are plenty of answers on google that state it as fact, but none answer why. I mean what is it about accelerating ...
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1answer
31 views

maximal acceleration of a wheel-driven vehicle

I was thinking about the maximal acceleration of a bicycle, I found a similar question. What remains unclear is that I found two coefficients of friction, one for rolling and one for static friction. ...
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2answers
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How does centripetal acceleration have direction/vector and magnitude while in the formula $v^2=v\cdot v$ is scalar?

$$a_c=v^2/r$$ 1. How does centripetal acceleration have direction or vector while in the formula dot product between velocity vector is scalar (as in kinetic energy)? Radius is scalar quantity. What ...
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1answer
40 views

Force during collision would be very high, would it cause a very big damage? [closed]

So suppose a body of mass 10kg travelling at 5m/s crashes into a wall, the time of deceleration would be very minute, say 0.01 second, then the magnitude of deceleration would be $$\frac {0-5}{0.01} ...
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3answers
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Regarding Goldstein's claim that $\mathbf{F} = \dot{\mathbf{p}}$

From Goldstein: ... The mechanics of the particle is contained in Newton's second law of motion, which states that there exist frames of reference in which the motion of the particle is described ...
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1answer
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In the equation for acceleration (with known $v$, $u$ and $s$) why velocity is squared and displacement is multiplied by 2? [closed]

In the following equation $$a = \frac{v^2 − u^2 } {2s} ,$$ where $v$ is the final velocity, $u$ is the initial velocity, and $s$ is displacement. Why is velocity squared and displacement multiplied by ...
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2answers
46 views

Could a rover drive to orbital velocity?

Could a rover, assuming it is on a perfectly smooth sphere in space, eventually reach orbital velocity? Would there be a limit on the possibile speed?
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2answers
42 views

Intuition for formula of tangential component of acceleration in general curvillinear motion

In certain problems of plane motion, the position of the particle P is defined by its polar coordinates $r$ and $\theta$. It is then convenient to resolve the velocity and acceleration of the particle ...
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1answer
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Reaching 99.9% of the speed of light $c$ at 1G acceleration [duplicate]

If an object in space accelerated at $9.8$ms$^{-2}$ constantly, and no other forces were experienced, how long would it take for the object to reach the $99.9\%$ of the speed of light $c$.