All Questions
11
questions
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47
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When a wheel begins to roll on a flat surface, is it due to fulcrum generated at the contact point by friction?
[Edit: What I'm trying to understand is how any wheel rolls on a surface, instead of just spinning in place. I know that friction provides the force to make the wheel roll, but I'm unsure about the ...
- 1
0
votes
1
answer
34
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How far a sphere will move if we stick smaller sphere at different positions
There is a big sphere of mass M and radius R, and a small sphere with mass m and radius r. Now smaller sphere is stuck at a certain height and angle $\theta$.
The ball would roll to some distance. I ...
6
votes
4
answers
4k
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Why do office chairs rotate when pushed/pulled out?
A common source of frustration when I'm at work is the fact that my rolling office chair's wheels rotate whenever I push it forward or backward from my desk, which can cause it to bump my computer ...
- 162
-1
votes
1
answer
252
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Why should the friction between two disks be zero when there velocity is same? [duplicate]
In this video here, Walter Lewin mentions two discs of different radius $r_1$ and $r_2$, of the same density, where the first disk is initially rotating, while the second is at rest. In the videos ...
- 1,149
0
votes
1
answer
138
views
Bearing spinning longer Horizontally
While performing a physics experiment, a fidget bearing was held horizontally, while spinning, and held vertically. The same torque was applied vertically, as well as horizontally on the bearings' ...
- 303
0
votes
2
answers
69
views
In which case will the kinetic energy be more after reaching the bottom? [closed]
In which case will the kinetic energy be more after reaching the bottom? The shaded surface have friction and other are smooth.
I thought about these questions:
Does the answer depend on whether ...
- 215
0
votes
1
answer
221
views
Barrel Rolling on concrete reverses its direction of motion
While reading my textbook I came across an activity which told :
Try rolling a barrel from concrete onto grass, what happens does the barrell reverses its direction of motion ? Is this because of ...
- 575
3
votes
4
answers
8k
views
In which direction does friction from the ground act on the wheel?
When a bicycle wheel is in motion, many forces are acting on it. The sum of the forces results in forward
motion. In which direction does friction from the ground act on the wheel?
- 212
2
votes
5
answers
24k
views
Acceleration of body rolling down inclined plane
Acceleration of a body rolling down an inclined plane is given by:
$$\frac{g\sin\theta}{1+\frac{k^2}{r^2}}$$
$g$=acceleration due to gravity
$\theta$=angle of inclined plane
$k$=radius of gyration
...
- 711
1
vote
1
answer
2k
views
How to model a very simple spinning wheel
First off, I'm not a physics person, just a lowly software engineer with below average math skills. What I've written is a simple animation of a spinning wheel using C++/GTK/Cairo. It allows the user ...
- 233
7
votes
1
answer
3k
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Does a tire need to slip to generate force?
Recently, I have been doing some research on racing and tire modelling. While I was doing this, I encountered many curves like those shown below.
(source: insideracingtechnology.com)
While I ...
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