# Tag Info

The sign function gives zero friction force for zero velocity, which is generally not correct (and leads to the artificial oscillations, as the integrator is made for smooth systems and cannot handle ...
• 106
Accepted

### Why Do the Fingers in Mechanical Pencils Fly Out?

The plastic fingers are moulded in the open position. During assembly and operation they are compressed. I imagine that the fingers are moulded so that with the ring in the position shown they are in ...
• 10.9k

### How to calculate wind impact to DIY solar panel array frame?

From your units, I'm assuming you're based in the US ? Have a look at the skyciv online wind calculator : https://skyciv.com/wind-load-calculator/ It has support for sussing out wind loads to ASCE7-16....
• 144
Accepted

### How to calculate force acting on axle from hub motor with known torque?

Assuming the motor has a Torque of 40Nm, what is the force on the fork centred at the axle? Since the system is fixed in place, there is no acceleration or rotation. Therefore any torque developed ...
• 136

### A question on understanding the nature of static equilibrium

In Engineering, we are usually not concerned with the detailed molecular level of material behavior. That is the job of material scientists and engineers. We assume a point load on a slab or on top ...
• 22.6k

### Understanding the nature of Force and Moment FBD diagram

Premise When you analyze the equilibrium of a body you first have to be sure that it is in a static configuration. In other words, it's bound to enough external constraints such that the reaction ...
1 vote
Accepted

### How do I relate tongue weight to weight x distance?

you need to jack up the car and check the structural layout of the hitch. Usually, there are two arms welded to the sides of the hitch receptor reaching to the left and right side of the mainframe of ...
• 22.6k
1 vote

### Why does restoring force of a spring vary directly with elongation or compression?

Metals don't stretch by moving apart: they stretch by moving sideways. Atoms move tangentially to their bonds. Strain at the lattice level is not aligned with strain at the macro level. Look at a ...
• 819
1 vote

### Why does restoring force of a spring vary directly with elongation or compression?

Hooke's law is an approximation good for small values of spring deflection. Here is why it's a good approximation: In a chunk of material being pulled in a tensile test, the pull force is very tiny ...
• 15.1k
1 vote

### Calculating forces of TV wall mount with long extended arm. Need help with Physics, torque vs force and anchor requirements

The important thing here is taking into account the dynamic load on the mount. Such as the impact of the vibration of banging a door or swinging the TV bracket into a new position. A dynamic load ...
• 22.6k
1 vote
Accepted

• 22.6k
1 vote
Accepted

### I am designing a light that is hung from the end of an arm. How do I calculate the amount of force on the fastener where the arm attaches to the wall

Convert mass and radius to Torque. The force would be distributed between fastener wall contact areas unevenly with very high pressure on the bottom edge puncturing the wall with the same torque but ...
1 vote
Accepted

### Calculate uphill efficiency on different gears

You found that the total energy needed to climb the hill is the same despite using two different gear ratios. This is in fact correct because of conservation of energy. Look at is from another point ...
• 81
1 vote

### Force required for a power generator in a coal power station

It is common practice to "motor" a turbine/generator assembly slowly in the absence of steam or water flow, while maintaining full lubricating oil pressure, so the sheer weight of the blade ...
• 15.1k

Only top scored, non community-wiki answers of a minimum length are eligible