13
votes
Does acceleration make you heavier?
Just to clarify, if I am in a car on Earth that is accelerating forwards at a rate of 2𝑔
, I won't feel twice as heavy?
You will feel more than twice as heavy. Here's what it looks like from the ...
- 11.1k
5
votes
Accepted
Question about acceleration
The force generated by the engine to accelerate the car forwards remains more or less constant (ignoring the effect of changing RPM), but the faster the car gets the greater the forces decelerating it ...
- 454
4
votes
Does acceleration make you heavier?
What is meant by "feels" here? Does this relate to the equivalence principle in general relativity
Yes, exactly.
From point of the physics laws happening in own reference frame- we can't ...
- 9,368
3
votes
Accepted
Why does a centrifuge cause blood to be pushed downwards in the human body?
Does that then mean that there is a centripetal (normal) force keeping the person travelling in a circle, and a centrifugal force...
The words, "centripetal" and "centrifugal" ...
- 11.1k
3
votes
Question about acceleration
When the car reaches the maximum acceleration it could possibly achieve, ignoring all other forces acting on it, it would have achieved a state known as 'terminal velocity', in accordance to Newton's ...
3
votes
Does acceleration make you heavier?
A body has a reluctance to accelerate and a measure of the reluctance is the mass of the body.
What you feel are the forces or lack of them that are applied to your body.
When you stand on the Earth ...
- 85.2k
3
votes
Accepted
Confusion regarding net acceleration of the bob in the bottommost point of the trajectory of a pendulum?
Consider a mass going around a circle of radius $r$ at constant speed $v$. Since we know how it moves, we can calculate the acceleration of this mass (the rate of change of velocity), irrespective of ...
- 8,711
2
votes
Does a simple pendulum have some radial acceleration at its extreme positions where its speed becomes zero?
Yes you are right - although you may have made a sin/cos error or defined angles differently than me. Since the velocity/angular velocity is zero, the tension in the string doesn't need to pull ...
2
votes
If $F=ma$ does that mean objects traveling at cosntant speeds have no force?
It means that in order for the elephant to remain at that velocity, the vector sum of all forces on the object must be zero, not that there are no forces on it.
By specifying constant velocity, there ...
- 36.6k
1
vote
Accepted
Change in $g$ effective due to rotation
Acceleration due to gravity at a certain latitude is given by :
$$g_{new}=g-R\omega^{2}cos\theta$$
where R is radius of earth(that is valid if you are on surface) , $\omega$ is angular velocity and $\...
- 509
1
vote
Force exerted on vehicle when hitting an object
From conservation of momentum you can calculate the impulse in this collision, but not the force itself. You would need more information on how the vehicle or the object/pedestrian deform or how long ...
- 1,892
1
vote
Accepted
A way of expressing acceleration in general relativity
The acceleration mentioned if the linked question:$$\frac{d^2\mathbf X}{dt^2} = -\nabla \phi$$ can be modified introducing a variable $\tau = at + b$ and expressed by components of the vectors to: $$\...
- 13.7k
1
vote
If $F=ma$ does that mean objects traveling at cosntant speeds have no force?
If an elephant, mass $3500\,\rm kg$, running at $7\,\rm m/s\,(=25 km/hr)$ hits you then there must be an interaction between you and the elephant.
In other words the elephant exerts a force on you and ...
- 85.2k
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