# 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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### Its a physics exam question, I and my friend don't understand the theory and mechanics behind it [closed]

Two spheres each of mass m are connected by string of length 2l, are kept on a smooth horizontal surface. A vertical force F is applied at the middle of the string. What is the max value of F for ...
1 vote
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### What is the work done by friction on a body from the perspective of different observers using the formula $-μmgl$?

Consider two observers moving with respect to each other at a speed $v$ along a straight line. They observe a block of mass $m$ moving a distance $l$ on a rough surface. The change in KE of the block ...
29 views

### Concept of work [closed]

How was the concept of work and energy invented in physics? What is the actual idea behind work and energy? Why are distance and force specifically used to define work, why not time instead of ...
8 views

### The work done by tension and normal forces are conservative or non-conservative? Give reasons [duplicate]

The work done by tension and normal forces are conservative or non-conservative? Tension as well as normal forces does work but has no field. Simultaneously their work is not always path dependent. ...
888 views

### Trying to understand Newton's Second Law [closed]

If I apply a force on an object at rest and it’s velocity is constant (after force is applied) wouldn’t that mean that the acceleration is 0? Then how would $F=Ma$ make sense? My thinking here is that ...
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### Pulsed Fluid jets

While feeling my shower head, switched to "pulsed jet" mode, exert a higher force on my body as compared to a regular flow jet, I have wondered why a pulsed jet is stronger than a non-pulsed ...
13 views

### Linear pull vs pulling at an angle [duplicate]

Why it seems much easier to pull an object in the horizontal plane, by attaching the rope to a "non moveable" object and the object that we need to move, then lifting the rope in the middle. ...