All Questions
Tagged with rotational-dynamics centripetal-force
105
questions
11
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5
answers
4k
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If you're holding on to a playground spinning wheel and then let go, is your trajectory straight or curved?
Let's say you are on one of those playground spinning wheels and then you let go. I've heard that you will fly off tangentially to the wheel, but do you really fly off in a straight line, since you ...
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0
votes
2
answers
54
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How does the centripetal force on the butt of a golf club's shaft produce torque that rotates the club/clubhead forward?
In the top picture, which is how torque is typically explained, the center of rotation is different than in the bottom picture. I think I understand how this works in the top picture, but I don't see ...
3
votes
2
answers
290
views
Normal force in a hypothetical rotating space station with artificial gravity
In order to simulate gravity on hypothetical space stations, one approach involves rotating the space station so that a centripetal force is present. Occupants within the space station's frame of ...
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1
vote
3
answers
136
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Why does a ball tied to a spring move outwards when rotated (ground frame)?
Suppose a bob or a ball is tied to a spring which in turn is pivoted to a certain point on a table as shown, if the ball is given velocity $v_o$ perpendicular to spring it moves in circular motion and ...
- 349
0
votes
2
answers
49
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How many components does the net force have on a rotating object?
I understand that there is the radial and tangential force components acting on a spinning object, but according to the attached image from my book, there is a third component F_1z that is ...
- 3
14
votes
7
answers
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Does a vehicle turning on a banked road need to turn its wheels?
A vehicle drives in a circle on a track at constant speed at with radius of curvature $\rho$. The vehicle's acceleration is $$a = \upsilon' T + \kappa (\upsilon)^2 N \\ = \kappa (\upsilon)^2 N.$$
The ...
- 309
1
vote
3
answers
140
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How high do the balls on a Centrifugal Governor lift?
Suppose you have one of these Centrifugal Governours
or a similar object. How to calculate the height that these balls have when the construct is spinning at a given speed?
- 33
0
votes
1
answer
62
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What forces are responsible for the circular motion of the center of mass of a gyroscope-like setup in precession?
Suppose we have a disk (of mass $M$) connected to a rod (of mass $m$) attached to a fixed pivot. (Note that initially I thought of the rod hanging off a rope, but I realized it would be better to ...
- 8,640
1
vote
1
answer
117
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What torques or acceleration is required to move a differential drive robot on a circular path?
When a differential drive robot moves on a circular arc with constant speed, its kinematics gets me constant wheel velocities. This appears to suggest that once a circular motion is reached and ...
- 11
0
votes
2
answers
185
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Centripetal Force on a ball kept on a rotating disc
Suppose I keep a ball some distance $r$ away from the centre of a rotating disc. Let's assume I keep the ball gently and slowly so as to not impart any velocity to the ball.
If the disc were to be ...
- 301
2
votes
2
answers
276
views
Friction on a Spinning Platform
I do not understand at all why, if an object is sitting on a spinning platform, the friction force is towards the center. I understand the need for a centripetal force during circular motion, but ...
0
votes
2
answers
68
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How to calculate the centripetal force along a cartesian axis?
If a centrifuge without a ballast is centered on the origin of an $x$-$y$ coordinate plane, and starts at the $x$-axis rotating with increasing velocity counter-clockwise around the origin, how can ...
- 6,044
0
votes
1
answer
51
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Force applied on edge of a cylinder due to water
We take a horizontal cylinder of length $L$ and fill it with incompressible water of mass $m$ and close the two ends with lids. If we start rotating the cylinder with respect to one of the ends,the ...
- 361
2
votes
2
answers
198
views
What exactly causes the velocity to change in conservation of angular momentum when an external force is applied?
Suppose an object is rotating in a circular motion, and we change increase its radius pulling it outwards in such a way that the net torque is always zero. In such a case, the angular momentum will be ...
- 21
0
votes
1
answer
55
views
Does a pinned and rotating rod receive centripetal forces?
Can a pinned rod (not just its particles) rotating around that pinned spot be considered undergoing circular motion? That is, is it rotating because after it has received a torque, it starts moving ...
- 3
0
votes
1
answer
337
views
"Centrifugal Force" felt in a turning car
From my understanding, when you are in a turning car, assuming that you are not touching any part of the car except the seat, the frictional force from the seat is acting as the centripetal force. Is ...
1
vote
1
answer
195
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Why is there a centripetal force acting on the rear wheels of a car when cornering?
There are quite a few questions about this in the general case (i.e. what is the source of the centripetal force when cornering?) but I don't understand what the origin of this force is specifically ...
- 123
1
vote
2
answers
347
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Centripetal Force Acting on a Belt and Pulley System [closed]
Just a warning: I am an A Level student looking for a simple but thorough explanation. I am happy to be introduced to new ideas, but a sesquipedalian answer with formulae that aren't derived will only ...
2
votes
2
answers
136
views
If one "fell" from the center of a spinning space station, which was creating "gravity" by using centripetal force, what forces would one feel?
Let's imagine a grand hamster wheel in space. The wheel is very large and is constructed of the same reasonably inelastic material. It has three main features: The first is a solid disk rotating at ...
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0
votes
2
answers
29
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Acceleration calculation for an object with is rotating about it's COM and it's COM is revolving about another object
I am confused with Pseudo force and circular motion.
Let's say a satellite is revolving in a circular orbit about a planet (Gravity is providing the centripetal acceleration). Now, an object (say A) ...
0
votes
2
answers
277
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Centripetal acceleration in rotational and translational motion
How do you find the centripetal acceleration of any point on a body performing both rotational and translational motion.
For example, in pure rolling if we find centripetal acceleration of the topmost ...
- 3
2
votes
6
answers
949
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What is the centripetal force when a bar rotates about its center of mass?
Scenario 1:
The centripetal force acting on the ball towards the center of rotation is $\frac{mv^2}{r}$, where $m =$ mass of the ball, $v =$ magnitude of the instantaneous linear velocity of the ball,...
- 1,018
4
votes
3
answers
994
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Centrifugal force effect in a rotating frame of reference
If the centrepital force doesn't exist in a rotating frame of reference, then in this frame perspective, how can we explain why a ball tied to a string following a circular motion not to be pushed ...
- 113
1
vote
1
answer
120
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Friction and centripetal force [closed]
Let us imagine that some object (A car possibly) is moving in a circular path. At some point of time let's say that the driver of car made a turn in order to follow the circular motion. Now my ...
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votes
3
answers
464
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Which is true: objects keep spinning because of inertia, or objects keep spinning because of centripetal force?
I'm hoping any gravity or friction can be ignored.
I gather a spinning object is a non-inertial frame. I suppose that's because change of direction is acceleration. Continued acceleration requires ...
user326693
0
votes
1
answer
101
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Why Doesn't Centripetal Force Counteract the Deflection of a Blade?
There was a similar question posted on this topic previously where it was agreed that the deflection of a rotating blade was decreased once the blade began rotating due to the centrifugal force. But I ...
- 275
2
votes
2
answers
706
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Man on a railroad car [closed]
I have the following problem: (taken from Introduction to mechanics, Daniel Kleppner, problem 6.6)
A man of mass $M$ stands on a railroad car that is rounding an unbanked turn of radius $R$ at speed $...
- 35
2
votes
8
answers
213
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Centrifugal Force: Why is it so real even from non-inertial frame? [closed]
I have thought about this for quite an amount of time. The questions:
(1) Suppose we tie a ball on a merry go round with a string. Now, we observe the ball from the merry go round and from the ground. ...
0
votes
1
answer
38
views
Rotation about axis of rigid body
Consider a rigid body rotating about a given axis then each of its particle is undergoing a circular motion. Then which is the force that provides centripetal acceleration.
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0
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2
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133
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Does an object performing a uniform circular motion rotate even when there is no angular acceleration?
Is a tangential acceleration, and thus an angular acceleration necessary for rotation to occur? If an object in a UCM rotates then would centripetal acceleration be sufficient to induce rotation? Then,...
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