Torque Definition and 1000 Threads

Homework Statement A marble of inertia m is held against the side of a hemispherical bowl as shown in (Figure 1) and then released. It rolls without slipping. The initial position of the marble is such that an imaginary line drawn from it to the center of curvature of the bowl makes an angle of...

I'm trying to determine how powerful of a stepper motor I need for a project. I am attempting to take a display that weighs 15lbs and transition it from laying flat to inclined (approximately 45 degrees) using a stepper motor. I had considered a linear actuator since it would have been an easier...

I have an electric motor that I am using to turn an auger to dispense pet food. I want to measure the average torque required to turn this auger at a given rpm. I know Powerin = Voltage into motor * Current into motor and Powerout = Torque exerted by shaft * RPM of auger and Powerout...

Homework Statement Consider two forces F and -F that act at different points on an extended object. Show that the net force of this combination is zero and that the torque about any point P is independent of the location of P, and depends only on the separation of the two points at which the...

Homework Statement Got a spicy one for you today. There is a cylinder of mass 5kg (M) with no angular velocity and no velocity, on a surface of static friction constant μ=0.6 . It's radius is .1 meters (R). Its baricentric moment of inertia is characterized by I=.5MR^2 . Gravity is 10m/s...

Homework Statement As shown in the attached figure, 2 forces ##F_1=3N## and ##F_2=5N## are applied on the rod of mass ##1## kg.The separation between the points of application of the 2 forces is 0.2 m. If the rod undergoes only translational motion, find the length of the rod. Note that...

The torque equation for a DC motor is: T = (P.Z.φ.I)/(2.π.A) Where: P = no. of poles Z = no. of winding conductors φ = flux per pole I = current A = no. of winding parallel paths My question concerns the "parallel paths". What are "parallel paths"? Why do they reduce the motor torque...

1. A solid disk of radius R and mass M is initially spinning clockwise with an angular velocity magnitude ω. It is placed against a flat, horizontal surface with a coefficient of kinetic friction of μ. Find the frictional torque magnitude on the disk, and how long it will take the disk to come...

Homework Statement An 11 kg traffic light hangs fro ma structure as shown. The aluminium pole AB is 7.5 m long, and weighs 8 kg. Determine the tension in cord CD Homework Equations T = rf[/B]The Attempt at a Solution Ignore the AC height of 3.8 m, and replace it with an AD length of 7.5...

Homework Statement Hello! I am doing some rough design on an elevator-system and I have now come to the brake. Here is my system: The text is norwegian but "rdriv" in the first image is "Rdrivskive" in the second image and it's this wheel that is dragging the rope. The "Brems" is where I...

Homework Statement A uniform steel beam has a mass of 1000kg. On it is resting half of an IDENTICAL beam, on one side. The length of the beam is L. The block and its' smaller counterpart are being held up by two poles, one on each side of the larger beam. What is the vertical support force for...

Homework Statement There is a string that is attached to a bar as shown below in the picture. What is the coefficient friction between the bar and floor before bar starts slipping. Reference...

Hi, I'm trying to figure out the minimum specs of each components of the new party bike I'll be building to make sure nothing fails prematurely, but I also don't want to over do it because of cost and weight. This is our current bike, for reference. We will use a similar design as a starting...

Homework Statement A 4.5-kg bowling ball is perched on a concrete ledge directly below your dorm room window, with the side of the ball opposite the holes touching the wall. Wanting to hold the ball in place so that it doesn't roll off and land on somebody, you manage to hook one of the holes...

Homework Statement A 10kg door is hanging on two hinges-the top hinge is 9in from the top of the door, and the bottom hinge is 9in from the bottom of the door. The width of the door is 36in and the height is 86in. If the bolt from the bottom hinge is removed, what force would someone have to...

[/PLAIN] A drum (see the figure) has a radius of 0.40 m and a moment of inertia of 6.9kg⋅m2. The frictional torque of the drum axle is 3.0 N⋅m. A 43m length of rope is wound around the rim. The drum is initially at rest. A constant force is applied to the free end of the rope until the rope is...

Hi fellas! I need to develop a system for a self driving car which involves automatically presses brake,clutch and accelerator when required.I am planning to use a servo for this purpose and have some trouble identifying the torque requirements! How much torque do i need?assume the lever...

Homework Statement A trailer carrying a boat is supported by a scale which initially reads 48 kg. The boat (and therefore its centre of gravity) is moved 0.15 m further back on the trailer. The scale now reads 37 kg. Find the mass of the boat (Ignore the 6.0 m distance because it was not given...

I'm confused about point 2. It says V=PQsintheta. How is that formula derived?

Let's say you've got two electric bicycles both powered by identical 250W motors. Both are fixed gear. Both weigh about the same and have riders of the same weight. Both riders contribute no force to pedalling - all the work is done by the motors. The only difference is the first bike has 20"...

hey...this is lokesh. I am really interested in automobiles but the problem is that i am a beginner. I am just not able to apply the concepts of inertia energy and torque on engines. Can you please suggest me any e-books or links which would help me clear my basics? Please reply asap. Desperate...

Can someone tell me if the parts of what I've done are right, and explain the questions I've missed. We have just done a lab on split-ring commutators and I'm currently doing a lab report. "Explain what is meant by the torque of an electric motor. Use a diagram" I've said that 'The torque of an...

I have tried to get some answers related to a humans ability to produce power and torque on cycling forums with mixed response. So I came to the experts to help me out! Basically some cyclist belief that the maximum torque a human can produce is solely limited by their body weight keeping them...

Hey, I have a project where my group needs to design a drill. I am wondering if anyone here knows how to calculate the torque we get from 3 AA-batteries on 3.6 V (10.6 V together). How does it work? It just needs to assemble furniture, so we don't need very much force on it. Do you know what...

Hi everyone, Homework Statement In the picture in attachment you can see 2 objects: "1" (it would be a door keeper) is able to move in direction "Y", "2" (it would be a lock latchbolt) is able to rotate around its axis. The 2 objects are in contact with each other. On the object "1" we have a...

Hello All, I have a quick question about torque and how it transfers to a coupled object. I am coupling a DC motor onto a worm gear and I need to calculate the tangential and axial forces on the worm. The Tangential Force equation is as follows: Fwt = (2*M1)/d1 where Fwt is the tangential...

Hi, I've been struggling on this homework problem for quite a few hours now and would really appreciate a pointing in the right direction. It's a fairly entertaining problem that I'm getting stuck on in several places. 1. Homework Statement The problem goes: "An erratic engineer, who lives in...

In the torque moment diagram of 4 stroke engine, there is a negative loop during suction stroke. Many books state that it is due to the higher atmospheric pressure. But, I do not understand the concept. Please help me understand why there is a negative and positive loop during suction and...

can kinetic friction cause a torque? (can it result in rotation) Or is it that only static friction can cause a torque? Can static friction do work on a rolling object? I think it can? because the rotational kinetic energy is increasing? is this right? HELP!

When a car moves forward, the wheel turns it exerts a force on the road in the opposite direction of travel, and friction counter acts it. the wheel turns and the car moves forward This implies that friction on the wheel is acting in the direction of the car moving. Though I thought that...

I am confused about whether objects when a nonuniform mass density experience net torque during free fall. If you take a rod that is heavier on one end and lighter on the other, should it not experience a net torque and angularly accelerate? But at the same time, the acceleration by gravity is...

Howdy! I have a 10 hp motor on a machine but it's only using 3 hp while it's running. The output shaft of the motor is connected to a bigger pulley to spin a wheel. Is there any way to increase the torque at the wheel while maintaining rpms? My first thought was to use more of the motor power...

Hello, I apologize if this is in the wrong sub-forum, as I am new to this site. Anyways, I am trying to figure out how much torque is needed to move a vehicle that is about 500 pounds in weight. That is including the driver of the vehicle. For a little more information, the vehicle would have...

I read this article: http://www.freestudy.co.uk/dynamics/gyros.pdf at the bottom of page 2, it bolded text it is said "Torque = rate of change of angular momentum" Is that right? It seems to suggest that Torque = (δ Angular momentum) / (δ time) but the units do not appear to work out. Torque...

Homework Statement The 29.5cm diameter disk rotates counterclockwise on an axle through its center. F1=20.8N, F2=58.6N, F3=58.6N, F4=20.8N, and d=5.27cm. What is the net torque about the axle? Let the counterclockwise direction be positive. Homework Equations Torque = force (perpendicular) x...

I used symbol M for torque by my mistake in equations,(because M is used in my language),If I am right americans use symbol T for torque. At equation (1) I get two unknowns : force T and force Rbx tried more equations but it gets more complicated,what am I doing wrong... note:I've choosen...

I still don't really get the concept of moments.. if moment is what makes things rotate, imagine this : ....... F (pushing down the stick) ===================(stick) A so : 1. the stick will rotate in a clockwise direction, 2. but the direction of the moment is negative Z.. (right hand rule)...

Hello everyone if someone can helo me out here I have a rotating shaft wiht a disc mounted on it.The moment of inertia of the total system is 170 kgm2.It is rotating with a veolicty of 20 deg /sec.i want to bring it to stand still within 80 deg travel from the application of brakes I=170 kgm2...

Homework Statement A massless stick of length d, held parallel to the ground, has a mass, m, attached at one end of it and a pivot on the other end. A second mass, m, is glued on at a distance x from the pivot. At what distance x would maximize the angular acceleration of the stick the instant...

So yeah, I understand that you can calculate torque as F*d, and you get a "number". But when you calculate a cross product of torque, r x F, what does that actually give you? It is a vector, perpendicular to F and r, but what "is" that? I mean, is it like an axis around which the object is...

Homework Statement Two discs of different radii and masses are kept on a smooth horizontal table and both are free to rotate about their fixed central vertical axis. One of them is given some angular velocity while other is stationary. The rims are brought in contact. There is friction between...

So I am specing out a motor that will be connected to a flywheel with a belt. Is the following formula correct? TFlywheel = (Rout / Rin ) x (Tin)

Hi there. What would happen if, while generating electricity with a fixed inlet power from the ICE, the alternator suddenly increase the out put demand by increasing the voltage? Does the engine would augment the torque while reducing RPMs? consider a self excited alternator, the voltage is...

Hello, I'm new to the forums but I had a problem I was trying to solve that I could use some help. Hoping someone here could point me in the right direction. Imagine you have two (2) cylindrical magnets that are diametrically magnetized. Both magnets are of equal size and magnetic strength...

I am designing a custom socket for an application at work and I am concerned about the wall thickness in the area marked by the red box (see attached drawing). The socket will be used to torque a nut to 500Nm. I have a degree in mechanical engineering and I can do stress calcs on straight...

Hi everyone, I am looking for any available experimental data which models off-road vehicle travel in clay and measures tyre and soil parameters. Parameters I am looking for include pull, torque, shear strength of the soil, sinkage, slip and deflection. If anyone knows of any available raw data...

Homework Statement The top of a ladder of L and mass m is connected to a wall by a horizontal cable. The ladder makes an angle Θ=60 with the horizontal. A woman of mass 2m finds that as she climbs the ladder, the ladder begins to slip when she is one-third of the way up the ladder. Find the...

Hi, Some "derivations" of the law of the lever argue with conservation of energy: If one arm of the lever of length ##r_1## is pulled by a distance ##s_1## with force ##F_1##, the other arm moves by a distance ##s_2=s_1 \frac{r_2}{r_1}##. From conservation of energy ##E=F_1 s_1=F_2 s_2## it...

Hello! I am an electrical engineer and have taken on a task to design a rotating wooden column. See attached image of the column. The requirements are to spin the column 360 degrees in 5 steps of 72 degrees each. The material used is wood. I know what I need to do in order to get it to spin...

I'm trying to determine how exactly gear ratio limits velocity. I know that a high torque configuration is generally regarded as low speed, but my calculations do not seem to support that. Basically, I've written a small problem where we have an input gear with constant torque and an output...