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Results tagged with forces
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user 6982
This tag is for the classical concept of forces, i.e. the quantities causing an acceleration of a body. It expands to the strong/electroweak force only insofar as they act comparable to ‘classical’ forces. Use the [particle-physics] tag for decay channels due to forces and [newtonian-mechanics] or one of the other subtopics of [classical-mechanics] for the dynamics of classical systems.
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Can a very thin sheet of any material float inside a liquid?
If the density of the material of your sheet is higher than the density of the liquid, then, the situation will be unstable, and it will collapse immediately by gravitational forces. … I would think that elasticity and bulk parameters come into play, which for infinitely thin sheets can not withstand the forces by water. …
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am i finding the force correctly?
You are confused by using $F=ma$, since, as you walk up the stairs, you are not accelerating, because you walk with a constant velocity. On the sack, we find a net force $F=0$. But, there is gravity a …
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Can we feel our own weight (can we feel normal reaction)?
I would assume it is was part of evolution that we don really feel it, because it would be very annoying to be continuously aware of the normal force.
However, you can try several things to redistrib …
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Is the tension in both ends the same (on a massed string)?
Suppose the string has length $L$ and mass $m$, and both boxes have mass $M$, then, as the total external force is $F$, the acceleration of all objects is $a$
$$ a = \frac{F}{2M+m}.$$
Assuming the t …
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Forces as vectors in Newtonian mechanics
I think what you are arriving at, will be rotational mechanics.
As long as objects just translate, you can just sum up the forced, and calculate the results for on the object, as you understand.
Whe …
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Why Humans can't carry themselves?
This comes down to the difference between internal and external forces on a body.
A system can only accelerate (i.e. being lifted), when there are external forces on a body. … Also in the ISS in the absence of gravitational forces, this is not possible. …
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Confusion about whether or not force can be exerted on air
Yes, this is Newton's third law of motion.
You can realize that when cars (or a quick runner) pass by. You will feel the draft of the air, moving along with the car. This air is set in motion by the c …
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Confusion about direction of friction
The direction of the dynamic friction for is always opposing the direction of motion. If it would not to that, the friction force would accelerate your object, which does not make sense.
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Reaction force exerted by pulley's support
Two things to note:
Since this is a pulley, there is also torque, since the forces are not acting on the center of mass (in this case the torques cancel). …
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Laws of Motion: Acceleration to be applied on a free falling object to reduce velocity to 0
At the moment the force F' starts to act, you will still have gravity. There is no net force, thus no deceleration.
If you this opposing force is indeed the only force, it will indeed take 10 seconds …
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The Double Integrator: Matching velocity and position as quickly as possible with only a lim...
In fact you can find two physical analogies here that can explain my answer
In a spring, the restoring force is proportional to the deflection from the equilibrium. With some damping along the way, …
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Pressure created by two equal magnitude opposing "pulling" forces
If I understand you situation correctly, you are increasing the size of a sealed bag. The volume increases, and hence, from the ideal gas law (i.e. pressure times volume is constant), you can expect t …
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