Does rolling friction increase speed of a wheel?Wheel moving without slidingHow does friction help the car to...
Was Opportunity's last message to Earth "My battery is low and it's getting dark"?
How can I deduce the power of a capacitor from its datasheet?
Renting a 2CV in France
Does rolling friction increase speed of a wheel?
Including proofs of known theorems in master's thesis
Are all power cords made equal?
Modern Algebraic Geometry and Analytic Number Theory
Can I travel from country A to country B to country C without going back to country A?
Can I use a single resistor for multiple LED with different +ve sources?
Putting a vertical line in each Histogram using GraphicsGrid
What if I miss a connection and don't have money to book next flight?
How to deal with an underperforming subordinate?
What's the reason that we have a different number of days each month?
What is an explicit bijection in combinatorics?
Calculating the strength of an ionic bond that contains poly-atomic ions
Is practicing on a digital piano harmful to an experienced piano player?
Do the speed limit reductions due to pollution also apply to electric cars in France?
Does red noise even at low values mean a hardware problem with my camera's sensor?
Boss asked me to sign a resignation paper without a date on it along with my new contract
What happened to Hermione’s clothing and other possessions after she wiped her parents’ memories of her?
Are there historical references that show that "diatonic" is a version of 'di-tonic' meaning 'two tonics'?
Is it possible to detect 100% of SQLi with a simple regex?
How to draw a node with two options using TikZ graphs in LaTeX
Is there a way to pause a running process on Linux systems and resume later?
Does rolling friction increase speed of a wheel?
Wheel moving without slidingHow does friction help the car to move forward?What role does static friction force play for a rolling object? How can I know what direction it points?Rolling w/o slipping - does a friction force acts in this scenario?Does friction act on a wheel rolling at a constant speeddirection of friction on an object rolling with constant speedDoes friction oppose rotational or translational motion?Why does the friction force on a smoothly rolling wheel cause the centre of mass to accelerate?Ideal rolling with friction - torque perspectiveFriction while Rolling Without Slipping
$begingroup$
I know there are a lot of questions about rolling friction, but I couldn't find any that addressed my specific problem.
Note the following picture where the wheel rotates clockwise. The rolling friction force $vec{F}_R$ points in the same direction as the rotation.
Normally, rolling friction inhibits the movement (speed $vec{v}$) of the system. However, since the force is pointing in the "backward" direction, it looks like it is increasing the speed of the wheel. Therefore, it should accelerate the system. This seems unintuitive to me. Can someone please clarify this contradiction?
Thanks!
newtonian-mechanics friction
asked 4 hours ago
user223687user223687
162
New contributor
user223687 is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
$endgroup$
add a comment |
$begingroup$
I know there are a lot of questions about rolling friction, but I couldn't find any that addressed my specific problem.
Note the following picture where the wheel rotates clockwise. The rolling friction force $vec{F}_R$ points in the same direction as the rotation.
Normally, rolling friction inhibits the movement (speed $vec{v}$) of the system. However, since the force is pointing in the "backward" direction, it looks like it is increasing the speed of the wheel. Therefore, it should accelerate the system. This seems unintuitive to me. Can someone please clarify this contradiction?
Thanks!
newtonian-mechanics friction
asked 4 hours ago
user223687user223687
162
New contributor
user223687 is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
$endgroup$
add a comment |
$begingroup$
I know there are a lot of questions about rolling friction, but I couldn't find any that addressed my specific problem.
Note the following picture where the wheel rotates clockwise. The rolling friction force $vec{F}_R$ points in the same direction as the rotation.
Normally, rolling friction inhibits the movement (speed $vec{v}$) of the system. However, since the force is pointing in the "backward" direction, it looks like it is increasing the speed of the wheel. Therefore, it should accelerate the system. This seems unintuitive to me. Can someone please clarify this contradiction?
Thanks!
newtonian-mechanics friction
asked 4 hours ago
user223687user223687
162
New contributor
user223687 is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
$endgroup$
I know there are a lot of questions about rolling friction, but I couldn't find any that addressed my specific problem.
Note the following picture where the wheel rotates clockwise. The rolling friction force $vec{F}_R$ points in the same direction as the rotation.
Normally, rolling friction inhibits the movement (speed $vec{v}$) of the system. However, since the force is pointing in the "backward" direction, it looks like it is increasing the speed of the wheel. Therefore, it should accelerate the system. This seems unintuitive to me. Can someone please clarify this contradiction?
Thanks!
newtonian-mechanics friction
newtonian-mechanics friction
asked 4 hours ago
user223687user223687
162
New contributor
user223687 is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
asked 4 hours ago
user223687user223687
162
New contributor
user223687 is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
asked 4 hours ago
user223687user223687
162
New contributor
user223687 is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
asked 4 hours ago
user223687user223687
162
asked 4 hours ago
user223687user223687
162
162
New contributor
user223687 is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
New contributor
user223687 is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
user223687 is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
add a comment |
add a comment |
3 Answers
3
active
oldest
votes
$begingroup$
Rolling wheels do not pivot about their centers. They pivot about the contact point with the floor, or in the case of deformation the centerline of the contact.
Move the center of rotation down by $R$ and reevaluate your torques; I think you will find they operate opposite of rotation.
answered 2 hours ago
cmscms
3,0472415
$endgroup$
$begingroup$
If I use R as the center of rotation, $vec{F}_R$ will not cause any torque!? Can you provide a sketch or a free body diagram? Intuitively, it makes sense, that the rolling resistance slows down the speed $vec{v}$, but I don't get the direction of the vector in terms of rotational direction.
$endgroup$
– user223687
6 mins ago
add a comment |
$begingroup$
The force pointing backwards is not increasing the SPEED...rather it is increasing its ANGULAR SPEED.
If you want a condition where rolling friction increases the SPEED, consider the condition when a rotating ring (or any other object capable of rolling) is kept on a surface. In that case the rolling friction will try to nullify the speed of the point of contact by increasing the SPEED and decreasing the ANGULAR SPEED until
Rw=v...where w is the angular velocity, v is the speed and R is the radius.
The diagram which you have given corresponds to the opposite case. Here, the object is given only a SPEED without ANGULAR SPEED. So, the force tends to increase ANGULAR SPEED and decrease SPEED to reach the required condition of rolling motion.
answered 1 hour ago
Sanket J HSanket J H
188
New contributor
Sanket J H is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
$endgroup$
$begingroup$
Why should the rolling resistance increase the angular speed of a car tyre. This would result in an increased car speed too, wouldn't it?
$endgroup$
– user223687
11 secs ago
add a comment |
$begingroup$
The body slows down because force other than friction are acting on the surface of the body in contact with the surface which is called the rolling resistance. Also the air resistance also contributes in decelerating the body. Moreover the the surfaces are not perfectly smooth. There are certain deformations(which are not visible to our naked eyes) , roughness etc both on the body and also on the surface this results in irregular directions of the normal force at each point of the surface in contact which provides the rolling resistance(horizontal component of the inclined normal force is responsible for slowing down the object). Also the rolling motion in the world is not pure rotation there is always some skidding or slipping which gives rise to kinetic friction which opposes the motion of the body thus slowing it down.
answered 1 hour ago
Harsh WasnikHarsh Wasnik
413
$endgroup$
add a comment |
Your Answer
StackExchange.ifUsing("editor", function () {
return StackExchange.using("mathjaxEditing", function () {
StackExchange.MarkdownEditor.creationCallbacks.add(function (editor, postfix) {
StackExchange.mathjaxEditing.prepareWmdForMathJax(editor, postfix, [["$", "$"], ["\\(","\\)"]]);
});
});
}, "mathjax-editing");
StackExchange.ready(function() {
var channelOptions = {
tags: "".split(" "),
id: "151"
};
initTagRenderer("".split(" "), "".split(" "), channelOptions);
StackExchange.using("externalEditor", function() {
// Have to fire editor after snippets, if snippets enabled
if (StackExchange.settings.snippets.snippetsEnabled) {
StackExchange.using("snippets", function() {
createEditor();
});
}
else {
createEditor();
}
});
function createEditor() {
StackExchange.prepareEditor({
heartbeatType: 'answer',
autoActivateHeartbeat: false,
convertImagesToLinks: false,
noModals: true,
showLowRepImageUploadWarning: true,
reputationToPostImages: null,
bindNavPrevention: true,
postfix: "",
imageUploader: {
brandingHtml: "Powered by u003ca class="icon-imgur-white" href="https://imgur.com/"u003eu003c/au003e",
contentPolicyHtml: "User contributions licensed under u003ca href="https://creativecommons.org/licenses/by-sa/3.0/"u003ecc by-sa 3.0 with attribution requiredu003c/au003e u003ca href="https://stackoverflow.com/legal/content-policy"u003e(content policy)u003c/au003e",
allowUrls: true
},
noCode: true, onDemand: true,
discardSelector: ".discard-answer"
,immediatelyShowMarkdownHelp:true
});
}
});
user223687 is a new contributor. Be nice, and check out our Code of Conduct.
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
StackExchange.ready(
function () {
StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2fphysics.stackexchange.com%2fquestions%2f462632%2fdoes-rolling-friction-increase-speed-of-a-wheel%23new-answer', 'question_page');
}
);
Post as a guest
Required, but never shown
3 Answers
3
active
oldest
votes
3 Answers
3
active
oldest
votes
active
oldest
votes
active
oldest
votes
$begingroup$
Rolling wheels do not pivot about their centers. They pivot about the contact point with the floor, or in the case of deformation the centerline of the contact.
Move the center of rotation down by $R$ and reevaluate your torques; I think you will find they operate opposite of rotation.
answered 2 hours ago
cmscms
3,0472415
$endgroup$
$begingroup$
If I use R as the center of rotation, $vec{F}_R$ will not cause any torque!? Can you provide a sketch or a free body diagram? Intuitively, it makes sense, that the rolling resistance slows down the speed $vec{v}$, but I don't get the direction of the vector in terms of rotational direction.
$endgroup$
– user223687
6 mins ago
add a comment |
$begingroup$
Rolling wheels do not pivot about their centers. They pivot about the contact point with the floor, or in the case of deformation the centerline of the contact.
Move the center of rotation down by $R$ and reevaluate your torques; I think you will find they operate opposite of rotation.
answered 2 hours ago
cmscms
3,0472415
$endgroup$
$begingroup$
If I use R as the center of rotation, $vec{F}_R$ will not cause any torque!? Can you provide a sketch or a free body diagram? Intuitively, it makes sense, that the rolling resistance slows down the speed $vec{v}$, but I don't get the direction of the vector in terms of rotational direction.
$endgroup$
– user223687
6 mins ago
add a comment |
$begingroup$
Rolling wheels do not pivot about their centers. They pivot about the contact point with the floor, or in the case of deformation the centerline of the contact.
Move the center of rotation down by $R$ and reevaluate your torques; I think you will find they operate opposite of rotation.
answered 2 hours ago
cmscms
3,0472415
$endgroup$
Rolling wheels do not pivot about their centers. They pivot about the contact point with the floor, or in the case of deformation the centerline of the contact.
Move the center of rotation down by $R$ and reevaluate your torques; I think you will find they operate opposite of rotation.
answered 2 hours ago
cmscms
3,0472415
answered 2 hours ago
cmscms
3,0472415
answered 2 hours ago
cmscms
3,0472415
answered 2 hours ago
cmscms
3,0472415
3,0472415
$begingroup$
If I use R as the center of rotation, $vec{F}_R$ will not cause any torque!? Can you provide a sketch or a free body diagram? Intuitively, it makes sense, that the rolling resistance slows down the speed $vec{v}$, but I don't get the direction of the vector in terms of rotational direction.
$endgroup$
– user223687
6 mins ago
add a comment |
$begingroup$
If I use R as the center of rotation, $vec{F}_R$ will not cause any torque!? Can you provide a sketch or a free body diagram? Intuitively, it makes sense, that the rolling resistance slows down the speed $vec{v}$, but I don't get the direction of the vector in terms of rotational direction.
$endgroup$
– user223687
6 mins ago
$begingroup$
If I use R as the center of rotation, $vec{F}_R$ will not cause any torque!? Can you provide a sketch or a free body diagram? Intuitively, it makes sense, that the rolling resistance slows down the speed $vec{v}$, but I don't get the direction of the vector in terms of rotational direction.
$endgroup$
– user223687
6 mins ago
$begingroup$
If I use R as the center of rotation, $vec{F}_R$ will not cause any torque!? Can you provide a sketch or a free body diagram? Intuitively, it makes sense, that the rolling resistance slows down the speed $vec{v}$, but I don't get the direction of the vector in terms of rotational direction.
$endgroup$
– user223687
6 mins ago
add a comment |
$begingroup$
The force pointing backwards is not increasing the SPEED...rather it is increasing its ANGULAR SPEED.
If you want a condition where rolling friction increases the SPEED, consider the condition when a rotating ring (or any other object capable of rolling) is kept on a surface. In that case the rolling friction will try to nullify the speed of the point of contact by increasing the SPEED and decreasing the ANGULAR SPEED until
Rw=v...where w is the angular velocity, v is the speed and R is the radius.
The diagram which you have given corresponds to the opposite case. Here, the object is given only a SPEED without ANGULAR SPEED. So, the force tends to increase ANGULAR SPEED and decrease SPEED to reach the required condition of rolling motion.
answered 1 hour ago
Sanket J HSanket J H
188
New contributor
Sanket J H is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
$endgroup$
$begingroup$
Why should the rolling resistance increase the angular speed of a car tyre. This would result in an increased car speed too, wouldn't it?
$endgroup$
– user223687
11 secs ago
add a comment |
$begingroup$
The force pointing backwards is not increasing the SPEED...rather it is increasing its ANGULAR SPEED.
If you want a condition where rolling friction increases the SPEED, consider the condition when a rotating ring (or any other object capable of rolling) is kept on a surface. In that case the rolling friction will try to nullify the speed of the point of contact by increasing the SPEED and decreasing the ANGULAR SPEED until
Rw=v...where w is the angular velocity, v is the speed and R is the radius.
The diagram which you have given corresponds to the opposite case. Here, the object is given only a SPEED without ANGULAR SPEED. So, the force tends to increase ANGULAR SPEED and decrease SPEED to reach the required condition of rolling motion.
answered 1 hour ago
Sanket J HSanket J H
188
New contributor
Sanket J H is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
$endgroup$
$begingroup$
Why should the rolling resistance increase the angular speed of a car tyre. This would result in an increased car speed too, wouldn't it?
$endgroup$
– user223687
11 secs ago
add a comment |
$begingroup$
The force pointing backwards is not increasing the SPEED...rather it is increasing its ANGULAR SPEED.
If you want a condition where rolling friction increases the SPEED, consider the condition when a rotating ring (or any other object capable of rolling) is kept on a surface. In that case the rolling friction will try to nullify the speed of the point of contact by increasing the SPEED and decreasing the ANGULAR SPEED until
Rw=v...where w is the angular velocity, v is the speed and R is the radius.
The diagram which you have given corresponds to the opposite case. Here, the object is given only a SPEED without ANGULAR SPEED. So, the force tends to increase ANGULAR SPEED and decrease SPEED to reach the required condition of rolling motion.
answered 1 hour ago
Sanket J HSanket J H
188
New contributor
Sanket J H is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
$endgroup$
The force pointing backwards is not increasing the SPEED...rather it is increasing its ANGULAR SPEED.
If you want a condition where rolling friction increases the SPEED, consider the condition when a rotating ring (or any other object capable of rolling) is kept on a surface. In that case the rolling friction will try to nullify the speed of the point of contact by increasing the SPEED and decreasing the ANGULAR SPEED until
Rw=v...where w is the angular velocity, v is the speed and R is the radius.
The diagram which you have given corresponds to the opposite case. Here, the object is given only a SPEED without ANGULAR SPEED. So, the force tends to increase ANGULAR SPEED and decrease SPEED to reach the required condition of rolling motion.
answered 1 hour ago
Sanket J HSanket J H
188
New contributor
Sanket J H is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
answered 1 hour ago
Sanket J HSanket J H
188
New contributor
Sanket J H is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
answered 1 hour ago
Sanket J HSanket J H
188
answered 1 hour ago
Sanket J HSanket J H
188
188
New contributor
Sanket J H is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
New contributor
Sanket J H is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
Sanket J H is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
$begingroup$
Why should the rolling resistance increase the angular speed of a car tyre. This would result in an increased car speed too, wouldn't it?
$endgroup$
– user223687
11 secs ago
add a comment |
$begingroup$
Why should the rolling resistance increase the angular speed of a car tyre. This would result in an increased car speed too, wouldn't it?
$endgroup$
– user223687
11 secs ago
$begingroup$
Why should the rolling resistance increase the angular speed of a car tyre. This would result in an increased car speed too, wouldn't it?
$endgroup$
– user223687
11 secs ago
$begingroup$
Why should the rolling resistance increase the angular speed of a car tyre. This would result in an increased car speed too, wouldn't it?
$endgroup$
– user223687
11 secs ago
add a comment |
$begingroup$
The body slows down because force other than friction are acting on the surface of the body in contact with the surface which is called the rolling resistance. Also the air resistance also contributes in decelerating the body. Moreover the the surfaces are not perfectly smooth. There are certain deformations(which are not visible to our naked eyes) , roughness etc both on the body and also on the surface this results in irregular directions of the normal force at each point of the surface in contact which provides the rolling resistance(horizontal component of the inclined normal force is responsible for slowing down the object). Also the rolling motion in the world is not pure rotation there is always some skidding or slipping which gives rise to kinetic friction which opposes the motion of the body thus slowing it down.
answered 1 hour ago
Harsh WasnikHarsh Wasnik
413
$endgroup$
add a comment |
$begingroup$
The body slows down because force other than friction are acting on the surface of the body in contact with the surface which is called the rolling resistance. Also the air resistance also contributes in decelerating the body. Moreover the the surfaces are not perfectly smooth. There are certain deformations(which are not visible to our naked eyes) , roughness etc both on the body and also on the surface this results in irregular directions of the normal force at each point of the surface in contact which provides the rolling resistance(horizontal component of the inclined normal force is responsible for slowing down the object). Also the rolling motion in the world is not pure rotation there is always some skidding or slipping which gives rise to kinetic friction which opposes the motion of the body thus slowing it down.
answered 1 hour ago
Harsh WasnikHarsh Wasnik
413
$endgroup$
add a comment |
$begingroup$
The body slows down because force other than friction are acting on the surface of the body in contact with the surface which is called the rolling resistance. Also the air resistance also contributes in decelerating the body. Moreover the the surfaces are not perfectly smooth. There are certain deformations(which are not visible to our naked eyes) , roughness etc both on the body and also on the surface this results in irregular directions of the normal force at each point of the surface in contact which provides the rolling resistance(horizontal component of the inclined normal force is responsible for slowing down the object). Also the rolling motion in the world is not pure rotation there is always some skidding or slipping which gives rise to kinetic friction which opposes the motion of the body thus slowing it down.
answered 1 hour ago
Harsh WasnikHarsh Wasnik
413
$endgroup$
The body slows down because force other than friction are acting on the surface of the body in contact with the surface which is called the rolling resistance. Also the air resistance also contributes in decelerating the body. Moreover the the surfaces are not perfectly smooth. There are certain deformations(which are not visible to our naked eyes) , roughness etc both on the body and also on the surface this results in irregular directions of the normal force at each point of the surface in contact which provides the rolling resistance(horizontal component of the inclined normal force is responsible for slowing down the object). Also the rolling motion in the world is not pure rotation there is always some skidding or slipping which gives rise to kinetic friction which opposes the motion of the body thus slowing it down.
answered 1 hour ago
Harsh WasnikHarsh Wasnik
413
answered 1 hour ago
Harsh WasnikHarsh Wasnik
413
answered 1 hour ago
Harsh WasnikHarsh Wasnik
413
answered 1 hour ago
Harsh WasnikHarsh Wasnik
413
413
add a comment |
add a comment |
user223687 is a new contributor. Be nice, and check out our Code of Conduct.
user223687 is a new contributor. Be nice, and check out our Code of Conduct.
user223687 is a new contributor. Be nice, and check out our Code of Conduct.
user223687 is a new contributor. Be nice, and check out our Code of Conduct.
Thanks for contributing an answer to Physics Stack Exchange!
- Please be sure to answer the question. Provide details and share your research!
But avoid …
- Asking for help, clarification, or responding to other answers.
- Making statements based on opinion; back them up with references or personal experience.
Use MathJax to format equations. MathJax reference.
To learn more, see our tips on writing great answers.
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
StackExchange.ready(
function () {
StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2fphysics.stackexchange.com%2fquestions%2f462632%2fdoes-rolling-friction-increase-speed-of-a-wheel%23new-answer', 'question_page');
}
);
Post as a guest
Required, but never shown
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
