All Questions
55 questions
0votes
1answer
41views
Problem regarding torque [closed]
I am unable to find a correct answer to this. X and Y are two forces (as shown in the figure below) 400 cm apart. O is the point midway between X and Y. P is a point along X. Calculate the sum of ...
-4votes
2answers
63views
How to calculate tension in this case? [closed]
I came up with this idea while learning rotational motion. Note: I have not found any question on it but its a concept I want to know. Take a rod of mass M and length L. Hang it with cealing using ...
0votes
2answers
143views
Why is the force applied at end of rod by the axis of rotation $R$, at time, $t=0$, equal to $R=\sqrt{(( M\cdot g)^2+( \frac{1}{2} \cdot F)^2)}$?
the question is regarding a problem in Rotational Motion for rigid bodies in AP Physics 1. I have tried to translate it as best as I could from Swedish. The problem is as follows: "A homogeneous ...
- 3
2votes
1answer
272views
At what $ω$ would the dust particles fly off the tilted rotating disc?
I've been struggling with question below: "A metal disc of radius R can rotate about the vertical axis passing through its centre. The top surface of the disc is uniformly covered with dust ...
- 367
0votes
1answer
58views
Can we model the pitch up of an aircraft due to sudden application of brakes while it is rolling down an inclined using angular impulse method? [closed]
Consider an aircraft parked on an inclined plane. Due to a mistake by the pilot the brakes were released, and the wheel chocks were missing. When the plane started to roll down, the pilot applied the ...
0votes
2answers
157views
Why is a ball that is moving in one direction and spinning in the opposite slowed down if the force of friction is tangential?
If a ball has linear and angular velocity such that there is a slip between the surface of the ball and ground, why does linear velocity of the center of the ball decrease if the force of friction is ...
- 112
1vote
2answers
256views
How to calculate the linear and angular velocity acceleration based an acting force?
In the first example there is an acting force perpendicular to the direction of the center of mass, resulting in a linear velocity acceleration in the direction of the force. In the second example ...
2votes
0answers
48views
Query regarding motion of a cylinder [closed]
I need help understanding the motion of this cylinder... Cylinder A of mass M is resting on two smooth edges, one fixed and other is that of a block B. At an instant block B is pulled toward left with ...
- 53
0votes
1answer
35views
Does the Mid-Point Between the Forces Move Up Or Down?
I've drawn an image of a thin rod with a mass at the end of it. The centre of mass is the red dot and I've drawn 2 forces applied at one end of the rod as shown. I understand there will be a net force ...
- 177
0votes
2answers
211views
Why Rod is harder to hold at the edge? [closed]
A Rod has length of 50cm and radius of 5cm with sides names say A and B . CASE 1 A bag is hanged in MIDDLE of the Rod name that C . Now a person holds that Rod with one hand from edge B . Now , the ...
1vote
2answers
492views
Deriving the rotational Lagrangian dynamics of a quad copter
I am reading a paper deriving the dynamics of quadcopters. There are no cross-terms in the dynamics of a quadcopter so the translational and rotational energies can be separated. The problem is the ...
2votes
2answers
182views
Acceleration of cylinder both rotating and moving under force from a pulley [closed]
The following states the problem 1.2 from the book Lagrangians And Hamiltonians by Patrick Hamill. A cylinder of mass $M$ and radius $R$ is set on end on a table at a distance $L$ from the edge, as ...
- 21
3votes
3answers
1kviews
Inverted pendulum on a cart - Lagrangian without moment of inertia?
I am modeling the inverted pendulum on a moving cart using Lagrangian methods. I see most examples model the pendulum's kinetic energy as a sum of translational and rotational components (using a $I\...
2votes
2answers
61views
Calculating coordinates of extra balancing mass [closed]
(https://i.sstatic.net/AjdKz.jpg) Hello, I have unbalanced mechanism which center of rotation is not in line with center of its mass and I'm trying to calculate coordinates $x_1$ and $y_1$ of mass ...
- 21
1vote
1answer
94views
Why $l\omega^2 = \sqrt{2}g$ in this mechanics problem?
I have a mechanics question (Source: Kleppner,Kolenkow; 2nd ed., p.104, problem 2.11), which states the following (along with an answer): [
- 13
