Net force is the vector sum of forces acting on a particle or body. The net force is a single force that replaces the effect of the original forces on the particle's motion. It gives the particle the same acceleration as all those actual forces together as described by Newton's second law of motion.
In physics, it is possible to determine the torque associated with the point of application of a net force so that it maintains the movement of jets of the object under the original system of forces. Its associated torque, the net force, becomes the resultant force and has the same effect on the rotational motion of the object as all actual forces taken together. It is possible for a system of forces to define a torque-free resultant force. In this case, the net force, when applied at the proper line of action, has the same effect on the body as all of the forces at their points of application. It is not always possible to find a torque-free resultant force.
Homework Statement
The pulley in the figure has radius 13.0 cm and a moment of inertia 0.230 kg m^2; the pulley is constructed from a dense metal. The rope does not slip on the pulley rim. The system is released from rest...
Homework Statement
A one-piece cylinder has a core section protruding from the larger drum and is free to rotate around its central axis. A rope wrapped around the drum of radius 1.14 m exerts a force of 4.41 N to the right on the cylinder. A rope wrapped around the core of radius 0.54 m...
The circular blade on a radial arm saw is turning at 265 rad/s at the instant the motor is turned off. In 12.0 s the speed of the blade is reduced to 85 rad/s. Assume the blade to be a uniform solid disk of radius 0.140 m and mass 0.400 kg. Find the net torque applied to the blade.
Relevant...
Homework Statement
A long straight rod has the following:
mass = 0.016 kg
length = 0.16 m
It is being pulled on by a force on its right end. The force pulls down on the rod, making an angle of 22.5 degrees with the vertical.
The magnitude of the force is 3.2E-2 N. Give the angular...
Homework Statement
http://online.physics.uiuc.edu/cgi/courses/shell/common/showme.pl?courses/phys211/oldexams/exam3/sp08/fig10.gif
What's the net torques about the pivot, represented by the dot (•), in the diagram D. The solid arrows represent the magnitude and direction of the forces...
Homework Statement
A certain wheel has a rotational inertia of 12 kg m2. As it turns through 5.0 rev its angular velocity increases from 5.0 rad/s to 6.0 rad/s. If the net torque is constant, its value is:
Homework Equations
Angular acceleration = dW/dT
Net torque = (angular...
Homework Statement
A light rope passes over a light frictionless pulley. One end is fastened to a bunch of bananas of mass m, and a monkey of mass m clings to the other end of the rope. The monkey climbs the rope in an attempt to reach the bananas.
(a) Treating the system as consisting of the...
Homework Statement
file:///C:/Documents%20and%20Settings/sjthompson/Desktop/p8-3.gif
Don't know if the image worked. I think if you copy and paste it into browser it might work.
Calculate the net torque (mag and direction) on the beam in the figure below about the following axes. Beam has...
Net torque and net force in equilibrium.. Help please
Homework Statement
The diagram shows a uniform plank of length 5.0m and weight 225N that rests horizontally on 2 supports, with 1,1 m of the plank hanging over the right support...
Explanation of "net torque" in a problem
I hate to ask such a simple question, but I was working on a problem where the idea of "net torque" was calculated differently than I thought. I more or less and just looking for the flaw in my logic and an explanation. :smile:
Here's the main...
Homework Statement
Part A:
A 5.73 kg mass is attached to a light cord, which is wound around a pulley. The pulley is a uniform solid cylinder of radius 9.14 cm and mass 1.26 kg. The acceleration of gravity is 9.8 m/s2 . What is the resultant net torque on the system about the center of the...
Homework Statement
"An athlete at the gym holds a 5.86 kg steel ball in his hand. His arm is 66.2 cm long and has a mass of 5.56 kg. What is the magnitude of the torque about his shoulder if he holds his arm straight out to his side, parallel to the floor?"
Homework Equations
torque =...
Homework Statement
This is the problem: http://session.masteringphysics.com/prob ...
A squar emetal plate .180 m on each side is pivoted about an axis through point O at its center and perpendicular to the plate. Calculate the net torque about this axis due to the three forces shown in the...
Homework Statement
A cylinder having a mass of 2.0kg can rotate about its central axis through point O. Forces are applied as show: F1 = 6.0N, F2 = 4.0N, F3 = 2.0 N, and F4 = 5.0N. Also, r = 5.0cm and R = 12 cm. Find the (a) magnitude and (b) direction of the angular acceleration of the...
I have a question.
For example there are three forces of diff magnitudes and are in three diff directions (not oppo directions) acting on a body. if the lines of action of the 3 forces pass through a common point, why the net torque abt that pt is zero?
Can someone help me pls?
Thanks!
hi i have a lab due and i can't figure this out. we have to find the mass of a paper clip using the net torque equations. we have 3 clamps attached to the fulcrum stand so we have to incorporate the force of gravity on them too. to make the stand level the paper clip attached to a clamp is at 50...
Homework Statement
The 19.6 cm diameter disk rotates on an axle through its center. F1=22.8 N, F2=32.5 N, F3=32.5 N, F4=22.8 N, and d=4.60 cm. What is the net torque about the axle?
Homework Equations
Torque = F r sin (angle)
F = m g
The Attempt at a Solution
I found all the...
Homework Statement
Find net torque.
Homework EquationsT = F(d) and T = F(d)sinx
Torque = T
Force = F
d = distanceThe Attempt at a Solution
100(0) - 200(4)sin40 - 120(14) + 150(8) = -994.2 Nm
Did I do this correctly? Notice I crossed out the 400N also because I think that it does not...
Homework Statement
see problem 4 attachment
Homework Equations
see problem 4 attempt attachment
The Attempt at a Solution
see problem 4 attempt attachment
Homework Statement
A 4.60 kg counterweight is attached to a light cord, which is wound around a spool. The spool is a uniform solid cylinder of radius 7.00 cm and mass 1.00 kg.
(a) What is the net torque on the system about the point O?
Magnitude: 3.16 N·m
(b) When the...
http://img225.imageshack.us/img225/6275/25534482ej9.jpg
http://g.imageshack.us/img225/25534482ej9.jpg/1/
attempt:
Tnet = F x r = (40N + 30N) x .03m
but something is wrong here...i don't know wht
Homework Statement
In the figure below, the incline is frictionless and the string passes through the centre of mass of each block. The pulley has moment of inertia I and radius R.
a) Find the net torque acting on the system (the two masses, string and pulley) about the centre of the pulley...
Homework Statement
Make the following into a web address; it wouldn't let me post one.
img161.imageshack.us/img161/3728/physicspv5.pngimg161.imageshack.us/img161/3728/physicspv5.b3825b8665.jpg[/url]
What is the net torque on this object?
Homework Equations
torque=(radius)(force)(sin(...
A constant nonzero net torque is exerted on an object. Which of the following can not be constant? Choose all that apply.
-angular position
-angular velocity
-angular acceleration
-location of center of mass
-moment of inertia
-kinetic energy
My guess is...
Calculate the net torque about point for the two forces applied as in the figure below
The rod and both forces are in the plane of the page.
torque= ? Nm
http://session.masteringphysics.com/problemAsset/1026433/5/yg.10.42.jpg
i know that F2 = 0 since its pointing through point 0...
Two blocks of masses M_1 and M_2 passes through a pulley (See the Fig. attached.). Assuming the friction between block and the incline is zero, and neglecting the mass of string find the net torque about the center of mass of the pulley.
I solved this problem with two different ways. The...
Homework Statement
Could someone explain this problem a little better to me.
Problem:
Calculate the net torque about the axle of the wheel shown in Fig. 8-39. Assume that a friction torque of 0.45 m·N opposes the motion and that F = 18.
*see attachment for picture.
I'm confused...
Homework Statement
Three forces are applied to a wheel of radius 0.350m, as shown in the figure. One force is perpendicular to the rim, one is tangent to it, and the other one makes a 40.0 angle with the radius.
a) What is the magnitude of the net torque on the wheel due to these...
[SOLVED] Net torque of uniform disk
Homework Statement
A uniform disk with a mass of 34.8 kg and a radius of 0.32 m is free to rotate about a frictionless axle. Forces of 90.0 N and 125 N are applied to the disk, as the drawing indicates.
What is the net torque produced by the two forces...
when is net torque equal to 0??
Each of the four bars shown can rotate freely in the horizontal plane about its left end. For which diagrams is the net torque equal to zero?
http://session.masteringphysics.com/problemAsset/1003642/26/170580B.jpg
_____
i know that for torque to equal O...
Homework Statement
What is the net torque on the pulley about the axle if T1 = 18N and T2 = 34N?
http://i241.photobucket.com/albums/ff4/alg5045/p13-11.gif
Homework Equations
The Attempt at a Solution
Torque is really confusing me. I have no ideas as to how to start this problem.
Question:
Evaluate the net torque about the pivot point for each of the following. For the third dimension, use a z axis pointing out of the paper.
a) a 3 m long, 95 kg uniform beam.
theres a picture to go along with it which I will describe as best I anthe 3 m long beams pivot point( P )...
Homework Statement
The 20-cm-diameter disk in the figure can rotate on an axle through its center.
What is the net torque about the axle?
image: http://session.masteringphysics.com/problemAsset/1000963/5/knight_Figure_13_14.jpg
Homework Equations
τ=Frsinφ
The Attempt at a...
Calculate the net torque about point O for the two forces applied as in the figure View Figure . The rod and both forces are in the plane of the page. Take positive torques to be counterclockwise.
A image is here to show the problem
What i did
12Nsin(30)*(2m)-(8N*3m)
or if you like this...
I'm taking a mechanics course & I'm confused regarding the difference of Net Force & Net Torque. Net Force refers to linear motion & Net Torque refers to rotational motion, correct?
So, is it possible to have a system where the net force is zero, but the net torque is not zero? For example...
http://img334.imageshack.us/img334/6018/omg8gp.th.png
Find the net torque about an axis through O
I know Torque = F*r*sin(angle) but how the heck am I supposed to get the radius for that?
This problem is due on my webassign homework in 3 hours and I can't get it right!
Calculate the net torque about the axle of the wheel shown in Fig. 8-39. Assume that a friction torque of 0.43 mN opposes the motion and that F = 26.
The picture is here...
A CD has a mass of 17 g and a radius of 6.0 cm. When inserted into a player, the CD starts from rest and accelerates to an angular velocity of 23 rad/s in 0.36 s. Assuming the CD is a uniform solid disk, determine the net torque acting on it.
I found the inertia which is 306 and got the...
hiya
Newton's law says if an object is not pushed or pulled upon, its velocity will naturally remain constant, or body will remain standing still
But is this only true if the sum of all torques is also zero?
If we pull on wheel (its axis attached to something so it doesn't fall down )...
I don't always pick up on little things in problems. In this particular problem, I am unsure of how to draw the picture when the car is rotated.
Here is the problem:
In San Francisco a very simple technique is used to turn around a cable car when it reaches the end of its route. The car...
I have a circle, multiple forces applied, I need to calculate net torque. I have tried it 4 times, no idea on what to do now.
http://session.masteringphysics.com/problemAsset/1000963/4/knight_Figure_13_14.jpg
That is the picture of the problem. Let me know if it doesn't work.
Thanks...
Force & net torque. Please Help!
I have two problems for homework that I just can't seem to figure out. Can someone please help me?! Thanks.
1) A jet transport has a weight of 2.97 x 106 N and is at rest on the runway. The two rear wheels are 17 m behind the front wheel, and the plane's...