# Questions tagged [forces]

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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### Force problem related to adhesive and bonding

I have two PCBs (printed circuit board), and they are glued by adhesives, as show in the pictures. And the location of the adhesives are indicated on the picture (please notice that NO adhesive is ...
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### How to calculate the required force to from lever to pushrod in order to close calliper in a hydraulic braking system?

How to calculate the required force to from lever to pushrod in order to close calliper in a hydraulic braking system? Through test and data i have determined the average force on a bicycle lever is ...
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### Will a bullet penetrate farther through 1,000 sheets of paper with no space between the sheets, or with space between them?

Consider a gun pointed at (normal to) a 1,000-page stack of paper. Which would a bullet penetrate farther into in terms of number of pages: the stack as-is, or the same 1,000 pages stacked with spaces ...
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### Minimum velocity required to "skip" a spacecraft across the atmosphere?

When, hopefully, Virgin Galactic spacecraft start regular operations in a few years time, they will be simply travelling upwards, then achieving weightlessness for a short while, followed by a ...
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### Calculating forces via Feynman diagrams?

How would one go about calculating forces that test objects feel using Feynman diagram methods? For example, say we have a massive object in GR so that the metric takes on the standard Schwarzschild ...
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### Will the beaker be acted upon by the force in the direction of the green arrow?

The black circle is the top view of the beaker. In the gravity field, the beaker is vertical down along the beaker axis. The beaker is still. The water in the beaker rotates at a uniform angular speed ...
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### Is there any possibility of Van der Waal forces being cumulative?

Is there any possibility of Van der Waal forces being cumulative? I have been thinking about this for a long time and have never came across an answer.
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### Newtons law of gravity from Wilson loops?

Wilson Loops in Quantum field theory $W_\gamma = trPexp(\int_0^1 dt \dot\gamma_\mu A^\mu)$ for curve $\gamma(t)$ and Connection $A^\mu$ are used to define an effective force law of a theory in a ...
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### What IS the precise angle of repose of Cadbury Creme Eggs, anyways?

So, in What If, made by xkcd guy Randall Munroe, an off-handed joke about his famous love of Cadbury Creme Eggs was made. In the image's mouseover text, Randall jokes his life's dream is to own ...
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### Could a hydrophobic surface increase a liquid's resistance to compression/displacement?

Imagine a quantity of an aqueous (yet slightly viscous) solution is resting on a hydrophobic surface with a contact angle around 100°. A downward force is then applied as a (repellant) surface is ...
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### Force of a solenoid on a ferromagnetic material

As I was trying to find an answer to another problem, I was informed that the equation I was using would not work. The equation I was using was $$F = (NI)^2\mu_0\frac{\text{Area}}{2g^2}$$ If this ...
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