All Questions
Tagged with homework-and-exercisesfree-body-diagram
555 questions
-1votes
0answers
43views
Circular Motion with a spring connected [closed]
How can the motion of a ball connected to spring, with some initial angular velocity be described mathematically for any general initial elongation and initial velocity? I have made some equations ...
0votes
0answers
83views
Horizontal Force - Tilted Disk (Rolling Quarter) [closed]
https://physics.stackexchange.com/q/72610 Can someone unpack the origin of this horizontal force for me a bit? I can see a torque about the center of mass from the static friction $ mR\Omega^2 r \sin \...
- 71
0votes
1answer
56views
Why is friction between two blocks considered first (not with the ground) when analyzing motion under horizontal force? [duplicate]
Consider a classic mechanics setup: A small block A of mass m is placed on top of a larger block B of mass M. The system rests on a horizontal rough surface. The coefficient of friction between all ...
- 101
-1votes
2answers
56views
(Rolling without slipping) Why is friction acting down the plane? [closed]
I'm quite stumpted on this question, What I've learned is that friction must be opposing the direction of motion so that it can produce a torque which allows the object to roll without slipping. ...
- 1
2votes
4answers
96views
Circular Motion: how can weight and friction act in the same direction without any opposing force?
Hi everyone, this question was on my (finished) exam recently. I am confused about how a component of weight and friction can both act in the same direction down the slope (as seen in the second ...
- 23
-4votes
2answers
87views
Question about how $F= 2ma$ [closed]
Hello everybody, I was reviewing this study guide that my professor provided and was confused by this problem. I understand the entire process of determining acceleration, however I was confused by ...
-1votes
1answer
62views
Physics IIT-JEE rotation question, getting two answers with two different approaches [closed]
Pulley System: Finding Acceleration and Angular Velocity I attempted to solve a problem involving two masses, $m_1$ and $m_2$, connected by a light string passing over a pulley of moment of inertia $I$...
1vote
1answer
77views
Why are there two different tension forces on a continuous string in the pulley system shown?
In an ideal pulley system with massless and frictionless strings and pulleys, the tension is typically uniform throughout a continuous string, even when the system is accelerating. However, when ...
- 11
0votes
1answer
47views
Forces being applied on the wall in two different situations
So the rod is of length $l$ and of uniform mass density $\sigma$ in the first case it is slanted at an angle $\theta$, and in second case, {a} length of the rod is placed parallely on the wall and the ...
- 39
1vote
1answer
50views
Kleppner and Kolenkow, Problem 5.19 [duplicate]
This is in reference to the following problem: $\textbf{Problem}$: (Coil of Rope) A uniform rope of mass density $\lambda$ per unit length is coiled on a smooth horizontal table. One end is pulled ...
- 327
2votes
0answers
96views
How can the relationship $ r_1 T_1 = r_2 T_2 $ be directly derived for a massless rod from Newton's second law of translational motion?
I am trying to understand the derivation of the torque equation $ \vec{r} \times \vec{F} = I \alpha $ In my book, it is derived easily using Newton's second law for a single point mass $ m $ at a ...
- 163
1vote
0answers
116views
Paradoxical Behaviour While Dealing with Rolling with Slipping (HW) [closed]
Edit: Ok, I don't understand how this counts as a 'check my work' question given that there is clearly a conceptual error here that I am not getting at. If my purpose was only to find out how to solve ...
0votes
1answer
137views
What is a universal way to solve "impact problems"?
I often see some physics problems of the following type: a system consisting of ropes, mass points, walls etc. is built; one or more objects in the system suddenly receives an impulse (but there is no ...
- 203
1vote
2answers
90views
Force of the impact on the ground of a man at the end of a jump
Let's say a man weighing 100 kg is on the ground. He jumps (with both feet together) 5 cm high and falls back to the ground. What is the approximate impact force (in Newton) when the person hits the ...
- 193
4votes
3answers
2kviews
Who exerts force on whom?
When a wheel is spinning, the tires interact with the surface in a way that generates static friction. Looking at this image, a question came to my mind, are the tires exerting static friction on the ...
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